I bought a planner and these were recommended to me by Amazon. I'm a pen hoarder, so I was surprised to see how inexpensive these were. I bought them because I have no self control, but they've turned out to be terrific quality! I use them at work to color coordinate information to be entered into production spreadsheets at a later date, and I'm very pleased with them. They don't bleed through, they have a fine tip that produces clean lines, and the colors are lonely and bright. Highly recommended.