The Polyurethane Tyred Nylon Wheels are used for high static load capacity, low abrasion, fracture resistant, high chemical resistance against alcohol, salt, grease and acids and maintenance free. N. C. Enterprises manufactures Polyurethane Tyred Nylon Wheels. N. C. Enterprises is an ISO 9001:2000 certified company that offers standard and specialized light-duty castor, medium-duty castor, heavy-duty castor and extra heavy-duty castor and wheels. Polyurethane, an elastomer with high breaking point offers excellent elasticity. Wheels are injection moulded under controlled temperature and pressure onto virgin quality nylon centers providing a single solid unit.