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Ernie Ball Regular Slinky Cobalt Electric Guitar Strings, 10-46 Gauge (P02721)

4.7 4.7 out of 5 stars 9,085 ratings
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Regular (10-46)
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Purchase options and add-ons

Brand Ernie Ball
String Gauge .01
Color Regular (10-46)
Instrument Electric Guitar
String Material Type Cobalt

About this item

  • Cobalt produces a stronger magnetic relationship between pickups and strings than any other alloy previously available
  • Cobalt electric guitar strings provide an extended dynamic range, incredible harmonic response, strong low end, and crisp, clear highs
  • Wound strings consist of Ernie Ball’s Cobalt alloy wrapped around a tin-plated high-carbon steel core wire
  • Preferred by players across many genres, Regular Slinky’s 10-to-46 gauge has become the industry standard
  • Made in California, USA with the finest and freshest materials
› See more product details

Frequently bought together

Ernie Ball Regular Slinky Cobalt Electric Guitar Strings, 10-46 Gauge (P02721)
This item: Ernie Ball Regular Slinky Cobalt Electric Guitar Strings, 10-46 Gauge (P02721)
$9.99
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Ernie Ball Regular Slinky Nickel Wound Electric Guitar Strings, 10-46 Gauge (P02221)
$6.99
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Ernie Ball Regular Slinky Coated Titanium Electric Guitar Strings, 10-46 Gauge (P03121)
$10.99
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Customer reviews

4.7 out of 5 stars
9,085 global ratings

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Customers say

Customers appreciate the high-quality strings for their sound and durability. They find the tone harmonic and warm, with a good mid-range. Many consider them worth the extra cost for the sustain and dynamics they provide. The strings feel smooth under the fingers and easy on frets. Customers also like the brightness, tuning, and tone.

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String qualitySound qualityDurabilityValue for moneyFeelBrightnessTuningTone
418 customers mention "String quality"342 positive76 negative

Customers like the strings. They say the cobalts are excellent for metal music, high-output electric guitar strings, and favorite strings to use for heavy metal. The high strings are smooth and slick for great speed, and the low strings feel warmer than standard nickel-coated strings.

"...-Sharp, clear tone -Each string is distinguishable from another -Durable -Silky smooth..." Read more

"These strings REALLY rock out!!! You get some great growl out of them, they are flexible and they just sound like they sparkle!..." Read more

"...These reacted a lot better than your standard nickel coated strings and sound warmer as well with very good mid-range!!!..." Read more

"...time I've bought these and both times he's said these are the best strings he's used." Read more

409 customers mention "Sound quality"366 positive43 negative

Customers appreciate the strings' sound quality. They mention they sound harmonic, warmer, and have a good mid-range. The tuning response is great, and the tone stays nice for longer than other brands. The strings cover everything from quiet blues to heavy distortion.

"...These strings sound quite a bit different, they have a much tighter mid to high and they seem to have less of a tendency to chaotically overlap each..." Read more

"...Cobalt seemed to pick up a bit stronger on my pickups, sounded great with heavy distortion...." Read more

"These strings REALLY rock out!!! You get some great growl out of them, they are flexible and they just sound like they sparkle!..." Read more

"...a lot better than your standard nickel coated strings and sound warmer as well with very good mid-range!!!..." Read more

191 customers mention "Durability"143 positive48 negative

Customers appreciate the strings' durability. They say the strings last long, are strong and loud, and have no issues with breakage. The quality is good and the strings maintain their tone without losing it over time. Some reviewers say the strings are the best Ernie Ball has to offer.

"...Sustains seem to last forever, and the clarity is incredible...only problem I'm having is trying to explain how it sounds in words...if you decide..." Read more

"...They sound warm with a lot of high end and deep bass. Very easily broken in...." Read more

"...I'm glad I gave them another try after some time. No more breakages and the sound is amazing...." Read more

"...these new strings, I broke the low E string--the core string broke at the tuning peg and then the winding just started pulling apart like a slinky...." Read more

185 customers mention "Value for money"150 positive35 negative

Customers like the value for money of the musical instrument strings. They say the strings are worth the extra cost, acceptable, and suitable for any playing style. The strings last a long time and maintain their utility.

"...guitar as soon as I got them in the mail, and I must say it was worth the wait. The first thing I noticed was the feel...." Read more

"...Very easily broken in. Great strings in my opinion for the money, I’d buy them even if they were double the price." Read more

"...Definitely reccomend for any playing style." Read more

"...I love them. They are my new go-to strings now, and they are worth the money you spend on them...." Read more

180 customers mention "Feel"127 positive53 negative

Customers appreciate the strings' feel. Some find them stiffer initially, but after a few sessions they feel normal again. The cobalt coating feels better on their fingers and provides a smooth under-the-finger experience. Many also mention that the strings have less tension than other high-end strings, which is great for playing guitar.

"...These strings sound quite a bit different, they have a much tighter mid to high and they seem to have less of a tendency to chaotically overlap each..." Read more

"...The Cobalt coating also feels better on my fingers. I've tried other Teflon coated strings and don't like them as it actually does deaden the sound...." Read more

"...shine, just seemed to be lacking in the lower tones I needed and felt stringy...." Read more

"...They feel light and are easy on the fingers. I haven't had any issues keeping them in tune either...." Read more

61 customers mention "Brightness"55 positive6 negative

Customers like the brighter sound and longer sustain of the cobalt strings. They find the appearance visually different from regular strings. The sound has a deeper bass and sparkling highs, with an increase in output before plugging in.

"...With the extra brightness you could really make each string shine, just seemed to be lacking in the lower tones I needed and felt stringy...." Read more

"...Again, still very bright, but yet now they no longer bleed notes into one another while annoying me to death with the sheer high-pitched treble...." Read more

"...and they sound incredible in drop c tuning and have kept the brightness for about 4 months now while sitting on a stand and being played very little...." Read more

"...But I can see how not everyone would like them. They are very bright and expressive. So good news - you hear everything...." Read more

57 customers mention "Tuning"50 positive7 negative

Customers appreciate the tuning of these strings. They stay in tune better, have good tuning response, and sound amazing with high gain. The strings hold their tuning well and seem to last longer than regular ones. The combination of tunability and extra life make these a pretty good value overall.

"...They're also a lot more sensitive to tuning adjustments, although after leaving them sit for two hours after JUST BEING INSTALLED, they were only 5..." Read more

"They last long, stay in tune. Great tone." Read more

"...Easily worth the 3 extra dollars a set honestly. And they stay in tune fairly well, not perfect, but pretty well." Read more

"...Problem solved, Rocksmith registers lower tuning without issue now, and pinch harmonics are crisp and clear with thicker strings, and a thicker pick...." Read more

47 customers mention "Tone"47 positive0 negative

Customers appreciate the clear, crisp tone of these strings. They like the nice overtones and good feel. The strings have a lot of output and a spectacular shine. They make fine jazz strings, are smooth and slick for great speed, and have a very loud, bright sound that is not tinny.

"...-Stay in tune very well (for me at least) -Sharp, clear tone -Each string is distinguishable from another -Durable..." Read more

"Out of the bag these seem nice. Thickness, tuning stability, and playability was spot on. So why three stars?..." Read more

"...strings will likely want to play downtuned metal, but they make fine jazz strings, too...." Read more

"I bought these for my Frankenstrat and ohhh do i love them. Crisp, tight and just feel like new socks ya know 🤷🏻‍♂️. I’ll be sticking with these..." Read more

THE Best Electric guitar strings.
5 out of 5 stars
THE Best Electric guitar strings.
High output electric guitar strings. The Best.
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Top reviews from the United States

  • Azothyran
    5.0 out of 5 stars Amazing strings, worth the hype!
    Reviewed in the United States on March 17, 2012
    Color: Regular (10-46)Style: Single PackVerified Purchase
    I installed these strings onto my ESP guitar as soon as I got them in the mail, and I must say it was worth the wait. The first thing I noticed was the feel. These strings are silky smooth, even the low E string. The second thing I noticed was the durability. As I pulled the string across the fretboard I noticed the reaction these strings have to the magnetic pickups...just like Ernie Ball claims, these strings react STRONGLY to magnets. I had to peel these strings off the pickups a few times while I was installing them. Then I noticed the durability of these strings as I tuned them. I felt a fair bit of resistance, much more than my old strings when I first installed them. They're also a lot more sensitive to tuning adjustments, although after leaving them sit for two hours after JUST BEING INSTALLED, they were only 5 cents off on the tuning. A small twitch of the tuning peg and they were back to where they should be. I figured, like any string, I would be fighting with them for the next few days trying to stretch them enough so they'll stay in tune without constant adjustment, but this is my third day of playing with them and they have stayed in perfect tuning since I installed them. I can't guarantee they will work for you the same way, but I know they will hold up to a lot more abuse than many other strings I've used so far. The final thing I noticed was the TONE. These strings sound quite a bit different, they have a much tighter mid to high and they seem to have less of a tendency to chaotically overlap each other's sound. Each string has a distinctive tonality that sets them apart from each other. You play the same note on different strings and you can easily hear the difference between the two. Sustains seem to last forever, and the clarity is incredible...only problem I'm having is trying to explain how it sounds in words...if you decide to buy them, try them with distortion and without, you'll be impressed by their versatility.

    To summarize,

    -Strong reaction to the magnets in pickups
    -Stay in tune very well (for me at least)
    -Sharp, clear tone
    -Each string is distinguishable from another
    -Durable
    -Silky smooth

    If you have any questions, shoot a comment if you want, but I am telling you, I would not hesitate to try these strings at least once.
    72 people found this helpful
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  • jason
    5.0 out of 5 stars Good strings / But if you usually prefer Super Slinky read this.
    Reviewed in the United States on October 5, 2024
    Color: Super (9-42)Style: Single PackVerified Purchase
    I usually use Super Slinky so if your like me and wanted to try these, here is a comparison from my opinion.

    1. These feel more "stringy" like looser and more wirey to play, the Super Slinky felt more thick and heavier.

    2: Cobalt is much brighter so if you play a more acoustic type style you will notice a pretty big difference. almost has a small sitar type of reverberation.

    3: Cobalt seemed to pick up a bit stronger on my pickups, sounded great with heavy distortion. With the extra brightness you could really make each string shine, just seemed to be lacking in the lower tones I needed and felt stringy. Super's provided a lower tone as well as the extra firmness I needed when playing.

    Overall I had to go back to super slinky, but may slap them on an extra rig for some distorted fuzz fun.
    5 people found this helpful
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  • Matt Moskowitz
    5.0 out of 5 stars Best, Most Responsive, Strings for my PRS Semi-hollow
    Reviewed in the United States on June 20, 2024
    Color: Power (11-48)Style: Single PackVerified Purchase
    These strings REALLY rock out!!! You get some great growl out of them, they are flexible and they just sound like they sparkle! The heavier gauge is what I was looking for and the Cobalt give them a lot of bite! They sound warm with a lot of high end and deep bass. Very easily broken in. Great strings in my opinion for the money, I’d buy them even if they were double the price.
    Customer image
    Matt Moskowitz
    5.0 out of 5 stars Best, Most Responsive, Strings for my PRS Semi-hollow
    Reviewed in the United States on June 20, 2024
    These strings REALLY rock out!!! You get some great growl out of them, they are flexible and they just sound like they sparkle! The heavier gauge is what I was looking for and the Cobalt give them a lot of bite! They sound warm with a lot of high end and deep bass. Very easily broken in. Great strings in my opinion for the money, I’d buy them even if they were double the price.
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    Customer imageCustomer image
    2 people found this helpful
    Helpful
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  • sha4rkbyt31
    5.0 out of 5 stars They do exactly what they're advertised for!
    Reviewed in the United States on July 27, 2024
    Color: Super (9-42)Style: Single PackVerified Purchase
    I bought these for my Schecter SVSS Green Reign which uses the Sustaniac pickup in the neck. These reacted a lot better than your standard nickel coated strings and sound warmer as well with very good mid-range!!! They're a bit easier to keep clean initially also and wipe down easier. The Cobalt coating also feels better on my fingers. I've tried other Teflon coated strings and don't like them as it actually does deaden the sound. Sure they last longer because they're easier to keep clean but I've had too many sets that leave ePTFE dust in your pickup cavity pockets AND the most popular brand? Your getting GHS Boomers at an inflated price with Teflon coating. $6.95 string set with Teflon is now $15.95 each if purchased in bulk. I worked for the company that produces these for 17 years. You're being scammed!
    2 people found this helpful
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  • Amazon Customer
    4.0 out of 5 stars Very bright but don't last very long.
    Reviewed in the United States on August 26, 2024
    Color: Regular (10-46)Style: Single PackVerified Purchase
    I love the bright jangly tone these strings produce, even on my Epiphone Les Paul humbuckers they really sound awesome! They feel light and are easy on the fingers. I haven't had any issues keeping them in tune either.

    They do get dull rather quickly compared to the standard Ernie Ball strings. I can get a little more than a month out of them before they start to sound muddy with around 1 hour of daily practice. If I had another guitar I would totally keep it set up with these strings, but they just don't sound good for long enough to use exclusively. Definitely worth a shot if you're looking for a brighter tone.
    One person found this helpful
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  • J. Botta
    5.0 out of 5 stars Killer Metal Rhythm strings
    Reviewed in the United States on December 28, 2024
    Color: Beefy (11-54)Style: Single PackVerified Purchase
    Strung these up on my Schecter Devil Tribal in drop C and as always Ernie Ball strings do not disappoint. Bright clear sound whether playing clean or distorted.
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  • Rain Miller
    5.0 out of 5 stars Good strings
    Reviewed in the United States on December 24, 2024
    Color: Regular (10-46)Style: 3-PackVerified Purchase
    Got head as a gift for my brother, he absolutely loves them. He got them and immediately changed the strings on one of his three guitars to these. This is the second time I've bought these and both times he's said these are the best strings he's used.
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  • Ondrea
    5.0 out of 5 stars Best strings so far
    Reviewed in the United States on December 7, 2024
    Color: Power (11-48)Style: Single PackVerified Purchase
    I am dead set on ernie ball strings for their flexibility and bright tone but the standard strings don't last very long. The cobalt, however, are amazing! I've had the same set on my ibanez for a solid 2 months and they still have that "fresh out of the package" bright sound. Definitely reccomend for any playing style.
    Helpful
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Top reviews from other countries

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  • Carlos
    5.0 out of 5 stars Buenas cuerdas
    Reviewed in Mexico on July 25, 2024
    Color: Super (9-42)Style: 3-PackVerified Purchase
    Las compré a bien precio y suenen bien. Las recomiendo
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    Carlos
    5.0 out of 5 stars Buenas cuerdas
    Reviewed in Mexico on July 25, 2024
    Las compré a bien precio y suenen bien. Las recomiendo
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  • Marco Gauthier
    5.0 out of 5 stars Very nice strings
    Reviewed in Canada on May 14, 2024
    Color: Super (9-42)Style: 3-PackVerified Purchase
    I used original Slinky strings for the last 20 years and I decided to try the newer cobalt version and I am really impressed by them. The sound output is louder and it is warmer than the original's. The sound quality does not drop as fast as the original's so they effectively last longer.

    String tension is a tad higher than the original. So you should have your guitar setup redone as it's going to mess with your neck relief and intonation.

    I ran into problems with 2 .009 stings (which broke instantly) and Ernie Balls were quick to help me and replace them free of charge. Great service!!!

    I am happy with these stings and I don't plan to go back to the originals.
    Report
  • Leonardo Silva
    5.0 out of 5 stars Qualidade
    Reviewed in Brazil on September 23, 2023
    Color: Power (11-48)Style: Single PackVerified Purchase
    Produto de extrema qualidade!!! Gostei muito do timbre e parece ter uma boa durabilidade
    Report
  • Amazon Customer
    5.0 out of 5 stars Very good strings
    Reviewed in the United Kingdom on October 21, 2024
    Color: Extra (8-38)Style: Single PackVerified Purchase
    I’ve not tried this particular one before, usually opting for the Ernie ball 9’s ( pink pack) but I wanted to try the 8’s , they are pretty good to be fair , not broken one ( yet , and I do tend to dig in a bit) stay in tune very well, ( after a good stretch) good sound and a decent price, will buy again, not had them long enough to rust yet, but I play every day so that’ll keep it down
    Report
  • Börje Ensgård
    5.0 out of 5 stars Bättre ljud än vanligt
    Reviewed in Sweden on October 4, 2024
    Color: Hybrid (9-46)Style: Single PackVerified Purchase
    Provade dessa för första gången och blev glatt överraskad hur bra dom kändes och lät.
    Customer image
    Börje Ensgård
    5.0 out of 5 stars Bättre ljud än vanligt
    Reviewed in Sweden on October 4, 2024
    Provade dessa för första gången och blev glatt överraskad hur bra dom kändes och lät.
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