- Constructed from durable PVC material, these covers are dirt-proof, waterproof, and lightweight, ensuring long-lasting protection for your books and documents. - Available in two sizes: small inner dimensions of 15.5 x 11.5 cm and large inner dimensions of approximately 22 x 16 cm. Small book cover measures about 17.5 x 13 cm, while the large book cover measures around 23.5 x 17.5 cm. Please measure your refill papers before purchasing to ensure a perfect fit. - Versatile design accommodates a variety of items, including notebooks, folders, scrapbooks, book covers, novels, and planners, making it an ideal choice for students, teachers, and professionals. - The transparent waterproof material allows for easy visibility of contents, helping you quickly identify your materials without the need to open each cover. - Perfect for everyday use: Protect your schoolwork, keep office documents organized, or safeguard personal planners from spills and dirt. Ideal for students, children, teachers, and office workers who need reliable and practical protection for their important materials.