Jumbo Stretchable Sports Book Cover is made of 4 way stretchable poly/spandex blend material easily stretches over book to protect it throughout the year. Jumbo size fits up to 9" wide x 11" long book, possibly larger depending on the thickness of the book. Comes in the four sports ball designs that kids love most. Protects those important textbooks throughout the year. These flexible book covers are a great idea for school stores or teachers' textbooks.