High-end seating at an economical price. Micro-cellular, self-skinning black polyurethane foam seat and back provide comfort and durability. Pneumatic seat height adjustment from 22" to 32". Ergo knob for backrest height and depth adjustment. Adjustable 18" footring. 24" diameter steel base with black nylon shell and glides. Seat: 18w x 16-1/2d. Back: 17w x 12h. Shpg. wt. 32 lbs. Assembly required.