Beautifully upholstered in black Leather. Leather is polyurethane infused for added softness and durability. Executive High Back styling with extra lumbar support . Extra thick seat and back cushion. Pneumatic gas lift provides instant seat height adjustment. Adjustable tilt tension control. Upright locking control. Durable polypropylene armrests. Large 27″ nylon base for greater stability. Hooded double wheel casters.Matching guest chair with cantilever base (B7309). Optional knee-tilt mechanism upgrade available. Comes standard with knee-tilt mechanism.