Pack of 10 A4 Frosted Green Exercise Book Covers by Janrax. Holds A4 Exercise Books. Simply slip the book cover into both jacket flaps for a neat fit protective cover that is weatherproof and wipeable. 10 Frosted Coloured Covers. Ideal for school and work books. Non-adhesive and reusable. Great way of colour coding subjects. Can be written on with permanent marker or customised with stickers etc. 110 micron thickness with 50mm overlapping flap.