Thank you for viewing! These are caps for the legs of Helinox chairs. They are 3D printed. Please use them at campsites, beaches, or other places where the ground is soft and the legs might sink. They also help prevent dirt. To attach them, hold the leg and push the cap on by hand. They have a stopper, so they won't come off unless you pull them off by hand. From the second set onwards, they are available for an additional 800 yen. Please comment if you would like to purchase additional sets, and I will create a dedicated listing for you. Material: PLA (plant-based plastic) Size: Outer diameter φ55mm, height 23mm Color: Black Quantity: 4 pieces (for one chair) Compatible models: Chair One, Chair One L, Chair Zero, Chair One Mini, Chair Two, Chair Two Home, Tactical Chair, Chair Home, Comfort Chair, and other models with a leg cap diameter of approximately 22.5mm (see photo 7) *Not compatible with models with larger plastic cap diameters, such as Swivel Chair, Sunset Chair, and Beach Chair. Please be aware. *Because they are made of plastic, they cannot be used indoors like chair ball feet, as they may scratch flooring. Also, they will not grip on asphalt or concrete, making them very dangerous as they will slip, so please do not use them on such surfaces. *There may be layer lines characteristic of 3D printing. *They will be shipped via Yu-Packet Post (Yu-Yu Mercari Bin). *Please refrain from negotiating discounts. If you have any other questions or requests, please feel free to comment. Thank you! Chair Ball Feet Vibram Ball Feet