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.