I bought these to practice formulas, mnemonics, etc. I was going through paper like crazy, and really didn't want to kill any more trees, so I bought these! I carry them in my notebook instead of sticking them to a surface, and they are instrumental in helping with memorization. They're thin enough to be convenient, but thick enough to be durable They've held up very well and clean easily. I recommended them to my classmates as well.See full review