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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, non-marking, very good chemical connection with the rim. Rim of mechanical cast iron. Hub on shielded ball bearings with central spacer. Heavy duty castor in zinc-chromium plated pressed steel turning on double rim of balls in temperate thrust bearings. Assembled with self-locking nut and plastic dust protection.