Safco Products 3386BL Zippi Plastic Extended Height Chair, Black Zippi extended height drafting chair Black solid plastic seat and ventilated back Features pneumatic seat height adjustment 23" to 33", 360 degree swivel, tilt adjust with tilt tension and tilt lock Overall height adjustability 41 1/2" to 52 1/2"H Adjustable chrome footring on steel frame with durable powder coat finish, mobile on five swivel casters