Inbox Zero basic industrial polyurethane chairs adjust to fit most body types and workstations. Optional 2-way adjustable armrests support a variety of arm placements for proper ergonomics. Inbox Zero polyurethane chairs are easily cleaned, making them ideal for almost any environment. Choose from rolling, non-marring casters (suitable for both hard and carpeted floors) non-marring ball glides (suitable for both hard and carpeted floors) on a nylon-reinforced fiberglass base. Optional foot rings are in nylon reinforced fiberglass. Each ergonomic polyurethane chair is backed by Inbox Zero 15-year warranty and lifetime on the pneumatic lift.