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Wheel coated with polyurethane, low-noise operation, low rolling resistance, good floor preservation, high abrasion resistance, high cut and tear propagation resistance and non-marking, very good chemical connection with the rim. Rim of mechanical cast iron. Hub on shielded ball bearings with central spacer. Extra heavy duty castor pressed and welded steel, turning on thrust and tapered bearings. Assembled with self-locking nut and plastic dust protection.