Set of 4 KUMON Japanese Language Textbook Holders, perfect for organization. - Brand: KUMON - Color: Green - Type: Individual Holders - Quantity: 4 I used these to hold completed textbooks at home. They are used. The thickness can be adjusted. Please check the photos. These are sturdy holders, so I hope someone can use them. I'm selling them. Please use the learning number labels by applying new label stickers, etc. Thank you for looking.