Product: The Book protective cover is flat, dry, and can be reused for a long time.The product is stretchable and elastic. It can meet the requirements of 9 x 11 Inches books without the need for measurement, bundling, or cutting. Can be used for most books, such as large textbooks, school books, story books, hardcover books, children's science books, etc Design: These book protectors sleeve are made of polyester fiber, which is particularly durable and easy to clean with a washing machine or hands. Elastic design for easy installation. Multiple pattern designs can be chosen according to children's preferences Perfect Gift: Every primary and secondary school student needs a book protector. This multi patterned backpack protective cover will surprise your girl/boy. This is also an ideal gift for cute girls/boys on birthdays and Christmas. This is also a Thanksgiving gift, a Halloween gift, and an Independence Day gift. Can be given to your child, boy, girl, or friend Note: Suitable for ages 4 and above 1-2cm error of measuring is a reasonable range due to different measurement methods Please allow some color difference due to different light