Key Features50-100 mm sizes fit general-purpose carts, fixtures and medium-duty castor assemblies. TPR tread is quiet, non-marking and suitable for light equipment that needs floor protection. PP tread is lightweight, economical, corrosion-resistant and easy to roll on clean indoor floors. PP rim/core construction supports the tread and improves wheel stability under load. Ball Bearing options are available for the required rolling resistance and service conditions.