These urethane rollers are designed for light load applications. They are optimal for sliding doors or for carrier transport. The urethane surface is molded directly to the special bearing for prevention of separation. The urethane body provides quiet operation. Non-collar and double-collar versions are available. Multiple covered bearing rollers can be used together in combination. The body is made from dark brown polyurethane, shore hardness A95. The bearing is made from steel, double rubber-sealed.