Zenergy Ball Chair, Gray Seat/Gray Back, Black Base. Perfect for use in a variety of applications including collaboration spaces, lobby areas, meeting rooms and personal workspace. Designed with a 17 1/2" (anti-burst) exercise ball, this chair provides an active seating experience that may potentially increase concentration and retention while potentialy helping to promote better posture and balance through building core muscle strength. Fully inflated seat height is 23", height will lower when occupied. Powder coated steel legs and stationary glides for stability. Pump included. Fabric. Recommended Applications: General Office & Task; Breakroom & Hospitality; Guest, Reception, Waiting Room & Lounge; Conference, Training & Meeting; Healthcare; Seat Color: Gray; Back Color: Gray; Color Family: Gray.