Ergonomic self skinned polyurethane seat resists wear. Cushioned seat is 1-1/2 thick, 13W x 10D with 6 x 6 contoured back. Tilt control knob allows seat to tilt up to 15 degrees with locking knob. Features pneumatic height adjustment from 21 to 31. The 5 blade base includes non-marring glides for stationary use. Holds up to 250 lbs. Weight 17 lbs. 1 Year Limited Warranty.