Boss Office Products B8902 Executive Leather High Back Chair with Mahgany Finish and Knee Tilt in Black Beautifully upholstered in Black Italian Leather;Matching hard wood arms with removable pads Matching hard wood arms with removable pads Passive ergonomic seating with built in lumbar support Upright locking positions; With knee tilt mechanism Pneumatic gas lift seat height adjustment; Adjustable tilt tension control