Flash Furniture HERCULES Series 24/7 Intensive Use Big & Tall 400 lb. Rated Black Mesh Multifunction Swivel Chair with Synchro-Tilt Contemporary 24/7 Multi-Shift Use Office Chair. Dual Paddle Control Mechanism 400 lb. Weight Capacity. High Back Design. Tilt Tension Adjustment Knob Seat size is 24 inches wide x 21.5 inches deep. Arm height from seat is 5.5 to 8.25 inch height Ventilated Mesh Back Material. Padded Black Fabric Upholstered Seat Adjustable Height Lumbar Support. 2-to-1 Synchro Tilt Adjustment Reinforced Back with metal frame support