Beautifully Upholstered In Black Leather plus. Leather plus Is Leather That 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" Chrome Base For Greater Stability. Hooded Double Wheel Casters. Matching Guest Chair With Cantilever Base (B7309). Optional Knee-Tilt Mechanism Upgrade Available. High Back Model (B7302) Mid Back Model (B7307)and;.