Muvtons premium polyurethane treaded wheels 93° ±3° shore a, firmly bonded to precision machined cast iron cores offer low rolling resistance, smooth & noiseless running are non-marking and floor protective. These wheels possess high abrasion & cut resistance and are resistant to tearing. Tested & guaranteed against bond failures. Wheel bearing options : sealed precision ball bearings, tapered roller bearings or roller bearings, color, light brown. Temperature range : -20°c to +85°c. Tread options: anti static : conductive wheels are available.