CASTLE BOOK SLEEVE: The book cover has a stylish and innovative pattern, which protects your book from dust or torn and bent pages, and is also a perfect gift for book lovers. SIZE: book sleeve about 8.66inch (22cm) wide, 11.02inch (28cm) long. Fits most self published books, standard paperbacks, mass paperbacks, and regular hardcovers. Make sure to measure your item before purchasing to ensure that it will work for you. WASHABLE FABRIC: Made of washable fabric, the black lining is dirt resistant and features a high-quality smooth zipper closure for added protection. Slim and lightweight, does not bulk your book up, can easily slide into your briefcase, backpack or other bag. EXTRA SLEEVE POCKET: This book cover can not only hold books, the extra sleeve pocket can also hold pens, glasses, bookmarks, notepad, headphones and other accessories, practical and beautiful in one. WIDELY USAGE: This book sleeves can be used to protect books, textbooks or notebooks and is suitable for students, teachers, writers, scholars, bookstores or anyone who likes books or wants to easily distinguish between them.