as the saying goes: " roots of science are bitter, but its fruit " sweet :) every year we buy new books, after the previous school year remains part of the half-filled, semi-non-sheets and usually goes in the trash. I propose to be friendly to the environment and have the covers, only to change the inner leaves (as far as this book is so). Notebook - book of 70 pages, with three tabs (it is safe to use three different things). fit the student and the student.