P> School workbook with licensed Mole Motor by Zdeněk Miler. The schoolbook lines no.523 have a 12 mm range . The workbook is made of irrelevant paper which means that the workbook was made of fibers not containing wood. 20 linked leaves are in A5 format. The lines are at a distance of 12mm . Workbook paper has a 70g/m2 . Unlike school workbooks of other brands that have a grammage of 60g/m2. Higher grammage means higher bending strength and tightening grammage ensures less translucency and better writing quality.