This is a set of 3 Kumon educational material binders. ★We can accommodate any combination of English, math, and Japanese if you purchase 3 binders. ★If you purchase without leaving a comment, we will send you 3 math binders. You can store Kumon printouts in these binders. The thickness can be adjusted for 200 sheets or 400 sheets. When you start learning, it's difficult to keep all the printouts, but you don't want to throw them away... so you can file them by subject. Also, for children who have advanced to higher-level materials, their own solved materials become the best reference books. Filing them by subject is also a great way to remember old grammar, etc., when you get stuck. They fit exactly 200 or 400 sheets, without creating wasted space. They are easy to put on a bookshelf. 《Material》 Please also see ↓ #Kumon related, children's enjoyable collection If you have any questions, please feel free to comment.