I bought these with my fingers crossed that they would work for what I needed.... being able to cut easily with my Cricut Expression or Silhouette Cameo and yet sturdy enough to make into boxes etc. I couldn't be happier with them, they cut SO EASILY (no double cut even needed) with both machines and yet are sturdy enough for the cutest little boxes or sour cream containers. They also work great for making windows on cards (run it through your xyron and cover with glitter, super pretty effect). I was getting sick of cutting up all the cartridge packets and asking everyone I knew to save their acetate packaging for me and these are the perfect alternative to that. I wish these came in a 12x12 size!
I couldn't find the product weight on these anywhere on the page, and didn't think to search the web by the product ID until AFTER they arrived! It looks like these are 6 mil thick. They are thick "enough" for regular use, but they're not quite the solid "nice" feel that I was after for the front covers of all the school materials I bind. I'm sure I will find a use for these, and they are a great price, but be aware that they're not heavy duty in the thickness arena!
This can be a bit pricey but in a long run... you will see that it's worth the money after all... I have seen people with those black cover on top of their notes but personally, i would prefer something transparent for my notes.