The 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 needed. The unique design may help to support better posture and balance. Its rubber molded base ensures that the chair keeps a steady grip and does not slip during use for a safe and steady alternative to a regular exercise ball. Air pump included. Designed by Thomas Walser.