This is a set of 3 Kumon educational material binders. ★For a set of 3, we can accommodate any combination of German, French, English, Math, and Japanese. ★If you purchase without a comment, we will send you 3 German binders. You can close and store Kumon printouts. The thickness can be adjusted for 200 sheets or 400 sheets. When you start learning, it's difficult to keep a vast amount of printouts, but it's hard to throw them away... so you can file them by subject. Also, for those who have advanced to higher-level materials, your own solved materials become the best reference books, so filing them by subject is a great way to remember old grammar, etc., when you don't understand something. They fit exactly 200 or 400 sheets and don't create wasted space. They are easy to put on a bookshelf. 《Material》Paper Please also take a look at ↓ #Kumon related, children's enjoyable collection If you have any questions, please feel free to comment.