This is a sturdy vocabulary notebook with high-quality paper, featuring 100 sheets per notebook and a ring binding. It's very comfortable to write on and durable. Even after repeated use as a vocabulary notebook, it doesn't easily wear out. I've used two notebooks, and I'm offering the remaining four. That's 100 sheets x 4 notebooks = 400 sheets in total. - Quantity: 100 sheets per notebook - Size: 90mm x 55mm - Type: Ring binding - Set: Set of 4 notebooks ※The photo shows a "set of 6 notebooks" for reference, but this listing is for 4 of those notebooks.