• One-piece, American-made, Black, nylon base • Full size diameter top and base for comfort and stability • 5-leg design for greater stability • Firm polyfoam padding • 4" thick seat for extra comfort • 2.5" dual wheel casters • Single lever, pneumatic height adjustment • All seats have 3/4" thick solid plywood base • Premium, stain-resistant, woven, knit-backed, vinyl upholstery • Knock-down design saves on shipping • Easy, no tools required assembly • Customizable with options including a backrest – see options • 250 lbs. load capacity under normal use