Applicable FormatOur clear book covers is designed to fit A4 Notebooks and books (297mm x 210mm). Adjustable DesignIt adopts an integrated design, which can cover thick books, and the width of one side of the book cover can be adjusted at will, which is convenient to adapt to the thickness of different books. Waterproof MaterialMade of PP, which is waterproof, can effectively protect the book from getting wet. Strong flexibility, no deformation after curling. Thicken Clear Book CoversThickened PP, durable and reusable, wearresistant, longer use time. Perfect ProtectorAn effective little helper to help you protect exercise books, folders, school cases & books from dust, dirt, humidity, bending, tearing and dogears. Features: Made of environmental friendly PP, durable and last a long time. Adjustable design of one side to fit the thickness of different books. Can effectively protect the book from getting wet. Protect childrens books from dirt, humidity and bending. A set of 10 pieces, well worth it. Specification: Material: PP Size:420 x 295mm Color: Transparent Package Including: 10 x Transparent Book CoversProducts from NIUNIU's store