2-mil crystal clear, gloss polyester film reveals your books' vibrant graphics and protects them from oil, dirt, grease, spills and rain. Unique film allows books to slide on and off the shelves without grabbing the books beside them for easier browsing and re-shelving. Adjusts to any book size with easy to use perforated liner; white paper backing offers added protection and allows the book jacket to simply slip into the cover. UV-resistant film protects book jacket covers from fading. Acid-Free and 100% archival safe. Instructions for applying covers: Step 1. Insert the jacket printed side down between the paper and film. Fold transparent film over onto paper backing and tape to hold in position. Crease film with a plastic folder. Book is now ready to be put into book jacket. Step 2. Wrap jacket around book. Lift jacket away from book and apply tape to hard outside cover of book. Wrap the tape over the edge of book and apply to the book jacket cover.