This is a plastic book cover made of material that is very durable It will protect your books from greasy fingers, dust, pen marks, grime and grime Transparent design helps you easily find the books you want Made of environmentally friendly materials, will not pollute nutrients Color: Transparent Material: Plastic This is a plastic book cover that is made of material so it is very durable It protects your book from greasy fingers, dust, pen marks, grime and grime Transparent design helps you easily find the book you need Made of environmentally friendly materials, will not pollute nature Perfect for students, easy to operate, just put the book cover into the two cover flaps Perfect product for students and kids A4: 30x21cm, suitable for A4 size books such as senior textbooks, tutoring books, exercise books, etc. A5: 22x15.5cm, suitable for A4 size books such as exercise books, small books, etc. 16K: 26x19cm, suitable for most elementary and primary school textbooks, Chinese, mathematics and other 16k size books Includes: 10x Book Cover