Includes 10 four-pocket refills for storing trading cards, photo cards, etc. Brand new, only opened to check the contents. Large capacity, perfect for supporting your favorite idols and collecting items. By changing the contents, it can also be used as a sticker book, sticker case, or planner. The actual measured sizes are: Binder: Approximately 19cm x 23cm Refills: 4 pockets x 10 sheets Bulk purchases are also welcome. Please feel free to let me know if you're interested. Shipping method may change for bulk purchases. Please note that this is an overseas product, so there may be minor scratches or color unevenness. If you are concerned, please refrain from purchasing. Quantities are limited, so please purchase early. I have checked the items, but if there is anything wrong with the product you receive, please let me know before leaving a review. I will respond with sincerity. It will be difficult to respond after a review has been left.