Zenergy Ball Chair, Backless, Supports Up to 250 lb, Black Fabric Seat, Silver BaseZenergy ball chairs are a unique seating option that encourages movement throughout the day and may help support better posture and balance. This ball chair has four legs with stationary glides to provide extra stability during movement. The legs are powder coated for long lasting durability. Great for use as a desk chair, in waiting rooms, meeting spaces, classroom or home for an alternative chair that allows for dynamic movement. Designed with a 17.