Carries higher capacities than rubber, outwears rubber and offers floor protection and quiet operation. Liquid cast in 3/8" or 1" thicknesses on cast iron, aluminimun, or forged steel. Increasingly popular and growing in variety, these wheels also offer great floor protection, easy rolling, and quiet operation. They are available in a multitude of tread thicknesses, wheel sizes, bearing options, and a wide variety of standard chemical compounds to cover many industrial applications.Since not one specific polyurethane is universally best, it warrants some investigation and scrutiny to determine the optimum wheel for a given application. Product descriptions and test results are available to assist in selection.