These handy little holders can be used in various ways. Put them on a bulletin board for an instant job chart. Use them to hold craft sticks, game pieces, small craft items or 3x5" index cards. Of course, you can put them inside the books in your classroom library, too! Self-adhesive backing makes them easy to attach to books, displays and more. Made from thick, durable paper that is acid-free and fade-resistant. 40 manila pockets, each measures 3-1/2 x 4-1/2".