Zenergy Swivel Ball Chair, Backless, Supports Up to 250 lb, Green Seat VinylThe Zenergy Swivel Ball Chair is playful in form and design. This upholstered 17. 5" exercise ball chair invites active seating and may help support enhanced focus and performance. The base swivels 360 degrees with active, user controlled movement for a more active and healthy workday. These ball chairs make for a great alternative desk chair or for use in meeting areas, gathering spaces, collaboration areas, the home or anywhere else a chair is