This is a set of 10 files, perfect for storing Kumon educational materials. Two of the files are new. Each file can hold 30 sheets of printouts. ★ With 10 files, you can accommodate any combination of English, math, and Japanese. For those who have just started studying, it's difficult to keep all the massive amounts of printouts, but it's hard to throw them away... so you can keep them organized 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 a great way to remember old grammar, etc., when you get stuck. Easy to store on a bookshelf. Please feel free to ask any questions in the comments.