Pneumatically adjusts 8" up or down while seated. Overall seat height adjusts 19" to 27". Contoured, black polyurethane self-skinning foam seat and back won't crack or peel with wear. Large nylon reinforced base with 20" diameter chrome-plated adjustable footring and 2" high-impact nylon reinforced glides. Pneumatically adjusts 8" up or down while seated. Backrest adjusts 3" in height and depth. Foam seat won't crack or peel. Large reinforced base ensures stability. Recommended Applications: Drafting, Warehouse & IndustrialStools; Seat/Back Color: Black; Arms Included: No; Pneumatic Seat Height Adjustment: Yes.