Tiger Stationery 9" X 7" Clear Strong Plastic Protective Exercise Book Covers Slip On Jackets X 3 Jackets designed to fit standard exercise books (23cm x 18cm). Jacket size = 9 Clear 150 micron thickness with 60mm overlapping flap Simply slip the book cover into both jacket flaps for a neat fit protective cover that is weatherproof and wipeable Non-adhesive and reusable. Can be written on with permanent marker or customised with stickers etc