Contemporary Office Chair Black Fabric Upholstery High Back Design with Headrest Padded Arms Built-In Lumbar Support Contoured Back and Seat with CAL 117 Fire Retardant Foam Tilt Lock Mechanism rocks/tilts the chair and locks in an upright position Tilt Tension Adjustment Knob adjusts the chair's backward tilt resistance Swivel Seat Pneumatic Seat Height Adjustment Heavy Duty Nylon Base Dual Wheel Casters