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 chemically, to precision machined cores. Proven for excellent performance in most demanding applications for manual and power 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° share 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.