This is a set of two binders for Kumon English materials. Shipping costs are higher for a single binder, but buying two makes it more affordable due to the reduced shipping cost. ❤︎ If you prefer a different combination than the one offered, we can swap them if we have them in stock, so please comment. ❤︎ If you wish to purchase multiple binders, please also consult with us in the comments. These are ring binders, so the pages won't close on their own. They are very convenient for studying while referring to grammar points or phrases you haven't memorized yet. The worksheets you've solved yourself become the best reference books. Also, the material is sturdy, so your worksheets won't get bent when you carry them around. These are thick, so shipping costs are quite high. If you purchase other items, we will ship them using the most affordable method, so please consult with us. 《Material》PP Please also take a look at: ↓ #KumonRelated, Children's Delight Collection Please feel free to ask any questions in the comments.