Office Star Mid Back Eco Leather Seat and Back, Locking Tilt Control and Polished Aluminum Arms and Base Executive Chair, Chocolate Eco Leather Seat and Back with Built-in Lumbar Support One Touch Pneumatic Seat Height Adjustment Locking Tilt Control with Adjustable Tilt Tension Polished Aluminum Arms Heavy Duty Polished Aluminum Base with Dual Wheel Carpet Casters