Ergonomic open mesh back designed to provide exceptional back support. Open mesh seat, ergonomically designed. Adjustable height and width armrests. 3 paddle multi-function tilting mechanism, which allows the seat and back to be independantly adjusted and locked in any position. Pneumatic gas lift seat height adjustment. Adjustable tilt tension control. Large 27" nylon base. Hooded double wheel casters. Black upholstery with a Black frame. 27"W x 30"D x 43-1/2"H Overall Dimensions.