Stretch Fabric Martial: These large stretchable book covers clothes are made of elastic fabric material, durable, protective, with fine workmanship, not easy to break or fade; reliable material for a long time. Fits Most Hardcover Book: Stretchable book cover about 9.84inch (25cm) wide x 15.74inch (40cm) long, textbook covers are stretch for your books up to 9 x 11 inches or a few inches larger than the dimensions, suitable for most hardback books. Reusable and Washable: These book sleeves covers are sewn with a proprietary sewing technique and reinforced on each side, extra reusable, durable, and easy to clean by washing machines or hand, lay the protector cover flat to dry. Easy To Install: You only need to stretch the jumbo book covers over the cover of your books, no measuring required, no taping or gluing required,the fabric book sleeves will protect your books against bumps, scratches, wears and tears for years. Widely Usage: Stretchable book covers can be used to protect books, textbooks or notebooks for students, teachers, writers, scholars, bookstores or anyone who loves books or wants to easily distinguish them.