Durable and economical, these task chairs feature pneumatic height control, polypropylene back shell, a height - and depth-adjustable hinged backrest, dual-wheel casters, and a 20" diameter reinforced nylon base. Seat height adjusts from 16" to 21". Seat cushion is 17"w x 16"d x 1¼" thick. Backrest is 15"w x 9"h. Available in black only.