Design & Details: Set of four rubber ball feet for added stability Rubber design provides stability on soft and uneven ground All four balls fit into a mesh carry bag for easy transporting Non-marking compound is safe for almost any surface 45mm size fits the following Helinox(R) chairs: Chair One, Chair One L, Chair Two, Chair One Mini, Speed Stool, and Chair Zero 55mm size fits the following Helinox(R) chairs: Chair One XL, Swivel Chair, Sunset Chair, Savanna Chair, and Bench One Specs: Assembled Height: 1.75" Assembled Width: 1.75" Assembled Length: 1.75" Assembled Weight: 8 oz. Packed Height: 2.5" Packed Width: 3" Packed Length: 10" Packed Weight: 9 oz. Models: VIBRAMBALLFT45, VIBRAMBALLFT55