Muvtons Ergonomic Wheels for effortless rolling, very low push-pull efforts required to move heavy loads. Generous amount of premium Polyurethane 93° ±3° Shore A, firmly bonded , mechanically & chemically, to precision machined cores. Proven for excellent performance in most demanding applications for manual and power towing. They are non-marking and floor protective. Tested & Guaranteed against bond failures. Softer 83° ±3° Shore A Durometer for greater tractive resistance and harder 73° ±3° Shore D polyurethane treads for extremely low rolling resistance are also offered. Wheel Bearing Options: Sealed precision ball bearings, tapered roller bearings or roller bearings. Temperature range : -20° C to +85° C. Tread Options : Anti-static ; conductive wheels are available.