I am a student in a masters program and read numerous texts at the same time. For years I used sticky plastic flags, but they are not reusable. These thin, folding book darts are flush with the book, and unlike the plastic flags, don't get bent or torn out while in my book bag. They also solve the waste problem. With an order of a hundred I am able to mark all of my books with passages that I need to remember for class discussions. Once done with that class, I simply pull them out and then use them for another class.