1, the loose-leaf ring is very round, even if it is full of paper (about 120 pages), it is not easy to get stuck when turning.

10 index separator page. (generally only 4-5). Its index is still double-layered. Because people buy this kind of large capacity, they definitely want to put different subjects/categories together, which is more convenient to find.

3, with a transparent loose-leaf bag, you can put some notes and documents.

There are two kinds of paper in the book, one is ordinary horizontal paper and the other is review paper.