High-performance task chair offers large seat and back cushions for support. Functions include back height adjustment, pneumatic seat-height adjustment, 360-degree swivel, tilt, tilt tension and asynchronous control. Five-star base is made of 16-gauge formed steel with a plastic base cap and has 2" hooded dual-wheel casters. Arms (height and width adjustable) for chairs are sold separately. Task chair meets or exceeds applicable ANSI/BIFMA standards. Certified by SCS to be in compliance with specific indoor air quality emission requirements.