Workbook 520, non -lined. The number of sheets 20. This workbook was developed on the basis of our philosophy of proven quality. It is made of unique paper that meets the strictest criteria of functional properties. The workbook came from cooperation with schools in the Czech Republic and fully meets all school requirements for constant quality. The bonus is also engaging the titles of the title pages. Meaning number 520: (5) - format A5 (2) - Number of sheets 20 (0) - Clean