DetailsContoured 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: Black; Arms Included: No; Pneumatic Seat Height Adjustment: Yes.