Mesh Screen Back Task Chair with Black Fabric Seat. Breathable Screen Back and Fabric Seat with Built-in Lumbar Support. One Touch Pneumatic Seat Height Adjustment. Heavy Duty Nylon Base with Dual Wheel Carpet Casters.* Breathable Screen Back and Fabric Seat with Built-in Lumbar Support * One Touch Pneumatic Seat Height Adjustment * Heavy Duty Nylon Base with Dual Wheel Carpet Casters Dimensions: 18.5" x 22.25" x 40"