Cast polyurethane offer low rolling resistance, smooth and noiseless running. It is floor protective and non marking. The tread has a high abrasion and cut resistance, and is resistant to oils, fats and a wide range of chemicals. It recovers to round shape after static load, and has a high resistance against picking up cuttings, gravel etc. The aluminium centre reduces the weight of the wheel, compared to a wheel with cast iron centre.