Flash Furniture Mid-Back Black Fabric Executive Swivel Chair with Nylon Arms Contemporary Office Chair Mid-Back Design Black Fabric Upholstery Tilt Lock Mechanism. Seat Size: 19.75 Inch W x 18.5 Inch D Tilt Tension Adjustment Knob Swivel Seat. Arm Height From Seat: 8 Inch H Pneumatic Seat Height Adjustment Nylon Arms Heavy Duty Nylon Base Dual Wheel Casters