This is a set of two Kumon binder for English materials. Shipping costs are higher for one binder, but buying two makes it more affordable. ❤︎ If you prefer a different combination, we can swap them if we have them in stock, so please comment. ❤︎ If you'd like to purchase multiple binders, please let us know in the comments. These are ring binders, so the pages won't close on their own. They're very convenient for studying while looking at grammar points or phrases you haven't memorized yet. The worksheets you solve yourself become the best reference books. Also, the material is sturdy, so your worksheets won't get creased when you carry them around. These are thick, so shipping costs are quite high. If you purchase other items, we will ship them in the most affordable way, so please consult with us. 《Material》PP See our other products here: See our other products here: ↓ #Kumon related, children's collection Please feel free to ask any questions in the comments.