Boss Office Products B6008 Mesh Task Chair with 3 Paddle Mechanism in Black Mesh Ergonomic open mesh back designed to provide exceptional back support; 3 paddle multi-function tilting mechanism Breathable mesh fabric seat with ample padding; With optional head rest Adjustable height armrests with soft polyurethane pads Seat tilt lock allows seat to lock throughout the tilt range; Padded back frame Back angle lock allows the seat to lock throughout the angle range for perfect back support Comfortable task chair with lumbar support and pneumatic seat height adjustment 3-paddle mechanism allows seat and back to lock in any tilt position; 250-pound capacity Breathable mesh black fabric seat with ample padding; open mesh mid back Adjustable arm height; double wheel casters; 27-inch nylon base; easy assembly Measures 28-1/2 inches wide by 27 inches deep; adjusts between 39-1/2 43 inches high