This is a binder ring from "PapiKnot (Papinotto)". The design allows for easy opening and closing by simply pushing one side, making it smooth to replace refills and customize the ring section of notebooks, planners, and sticker books. [From the official website] ◎ Body size (per piece): H41xW17xD19mm ◎ Weight: Approximately 9g ◎ Material: Polypropylene ◎ Specifications: 5-hole ring, set of 2 ※ Recommended refill capacity: Approximately 60 sheets ● Please keep out of reach of small children. ● Avoid use and storage in places with high temperature, humidity, or direct sunlight. ● Be careful not to pinch your fingers when opening and closing the ring. ● Do not drop the product or subject it to strong impacts. The ring may open, deform, or break. ● We are not responsible for any damage, injury, or accidents caused by the use of this product. ● Depending on the thickness when using the dedicated cover and refills, opening and closing may be difficult (recommended capacity: approximately 60 sheets). Please refrain from purchasing if you are nervous or seeking perfection, as this item is stored at a private residence. Immediate purchase is OK, please read the profile, and comments are required after purchase. We are looking forward to your purchase if you understand initial scratches, etc. Planner customization Loose-leaf ring Rollbahn customization