Beautifully upholstered with Black LeatherPlus.LeatherPlus is leather that is polyurethane infused for added softness and durability. Dacron Filled Cushions. Ratchet back height adjustment mechanism which allows perfect position of the back cushion and lumbar support. Adjustable tilt tension control. Adjustable seat and back angle. Adjustable height armrests with soft polyurethane pad. Large 27" nylon base for greater stability. Hooded double wheel casters. Upright locking position. 3 paddle multi-function tilting mechanism which allows the seat and back to lock in any position throughout the tilt range. Pneumatic gas lift seat height adjustment. Optional seat slider (B750-SS).