Heavy-duty deluxe stool for people who use counter-height work surfaces. Thick 2-ply HR foam fully upholstered back with built-in lumbar support and waterfall edge 3-ply HR foam seat cushion or True Comfort cushion. The mechanism provides tension control, independent seat angle with infinite locking control, independent back angle control, forward tilt pivot and pneumatic seat adjustments. Includes heavy-duty pneumatic long-life cylinder, extra heavy aluminum cast base with 100 lbs. per wheel capacity casters. Your choice of upholstery in Fabric Grades I, II, III, IV, V and COM; True Comfort is available only in Grade II Astral fabric. Assembly required.