These adhesive manila library pockets are a must-have for every classroom. Teachers and librarians use them for library management, storing flashcards, attendance charts and more. The manila library pockets have a deep, low back and are made from thick, durable paper that is acid free and fade resistant. This will help prevent the miniature envelopes from turning yellow or wearing down easily. The self adhesive backing on the small manila pockets makes attaching a breeze. Just peel and stick to any book, DVD, CD, or anything that needs a pocket. Convenient Size: These deep low pockets are 3.5" wide and 4.5" tall, perfect for flash cards and standard 3" x5" index cards. Each pack includes 300 self-adhesive pockets.