I purchased this here before. I inserted a refill once after purchase, but I haven't used it. I bought a different color, so I'm selling this one while it's still in good condition! Size: M5 Ring diameter: 16mm Evercolor Etmupe The ring diameter is large, so you can fit a lot of refills. It's a very nice planner. The included accessory is a storage bag. There was no box from the time of purchase. Retail price: 39,600 yen