Our ergonomic polyurethane stools feature a 360° all-around adjustment ring that can be operated from any position. These stools feature your choice of black rolling, non-marring casters (suitable for both hard and carpeted floors) or black, non-marring bell glides (suitable for both hard and carpeted floors) on a nylon-reinforced fiberglass base. Our rugged polyurethane round seat is self-skinning, chemical- and puncture-resistant, and fully washable. Optional foot rings are available in 18 ¼-inch diameter, black, nylon-reinforced fiberglass or 18-inch diameter chrome on medium bench height and high bench height. Each ergonomic stool is backed by our 15-year warranty, lifetime on the pneumatic cylinder. This stool is available in desk, medium, or high bench height.