Contoured seat and back provide added comfort for long hours at your desk. Features pneumatic seat adjustment and rotates a full 360° in either direction for ease of motion. Black five-star base with casters. Durable 100% acrylic upholstery. Optional Arms sold and shipped separately. Recommended Applications: General Office & Task; Seat/Back Color: Gray; Features & Functions: Pneumatic Seat Height Adjustment; Seat Glide Mechanism.