The nonslip surface of these polyurethane stool rings is ideal for use in sterile or harsh environments. With industrial quality for heavy duty use. Strong polyurethane material creating a durable finish that is easy to clean. Suitable for Clean Room applications, Industrial, Pharmaceutical, Labs and many others. For added comfort this item is available on most models of chairs as well. Popular for students, designers, draughtsman, architectural, laboratory technicians, doctors and many other professionals.