Functions include pneumatic seat-height adjustment, 360-degree swivel, tilt, tilt tension and tilt lock. Design includes a black frame made of heavy-gauge steel and urethane loop arms. Sturdy, textured metal frame ensures strength and stability. Five-star plastic base has 2″ hooded dual-wheel carpet casters. Seat measures 20-1/2″ wide x 18-1/4″ deep x 17-7/16″ to 20-15/16″ high from the floor. Back size is 20-1/2″ wide x 26″ high from the seat. Distance between arms is 20-1/2″. Chair weighs 32 lb.