Flash Furniture - Mid Back Swivel Office Chair - BlackModern Colorful Task Office Chair, Mid Back Design, Ventilated Mesh Back, Built In Lumbar Support, Tilt Lock, Mechanism rocks tilts the chair and locks in an upright position, Tilt Tension Adjustment Knob adjusts the chair's backward tilt resistance, Padded Black Mesh Upholstered Seat with CAL 117 Fire Retardant Foam, Waterfall Seat reduces pressure on your legs, Swivel Seat, Pneumatic Seat Height Adjustment, Nylon Arms, Heavy Duty Chrome Base, Dual