Black Mesh Office Computer Chair with Chrome Base and Height Adjustment Specification Thickly Padded, Mesh over Foam Seat Open Air Mesh Back Passive Lumbar Support Band on Curved Back for Increased Ergonomic Comfort Height Adjustable Nylon T-Arms Soft Polyurethane Padded Arm Rests Spring Tilt Control Mechanism Pneumatic Seat Height Adjustment Tilt Tension Control Chrome Finished Gas Lift Chrome Finished Base Dual Wheel Nylon Casters Dimensions Seat Size: 19''W x 19.25''D Back Size: 20.5''W x 20.5''H Seat Height: 18.25 - 21.75''H Arm Height From Floor: 25 - 31.75''H Arm Height From Seat: 6.75 - 9.5''H Overall Width: 24''W Overall Depth: 28''D Overall Height: 36.5 - 40''H