Exercise books do not need a cover. What they do need is colour to match the school subject. With the so-isi exercise books, the corners can simply be painted in the desired colour by the schoolchildren themselves. This is done in no time at all and the exercise book quickly gets the right individual colour. The use of so-isi exercise books means that there is no need for an additional plastic or paper cover, so there is no waste in the first place. Environmentally friendly, manufactured in Germany with the Blue Angel.