Ribbed Back Task Chair with polypropylene fixed arms offers exceptional features such as tilt tension, a pneumatic gas lift for easy height adjustments and an upright lock. The chair is upholstered in black vinyl, called Caressoft Plus which is ultra-soft, breathable upholstery that looks & feels like leather, but more durable & easy to clean. It also boasts a sturdy high crown 25 inch nylon base with 2 inch nylon dual wheel castors for a smooth roll and has a weight limit of 275 lbs.