Swivel castors with a Fabricated black castor bracket, fitted with a Rubber On Cast Iron Core wheel. These swivel casters range from 100mm-200mm and have a capacity up to 500 Kg per caster. Elasticated rubber on cast iron tread castor wheels have higher capacity than standard rubber and are very strong. These castors do not mark floors or develop flats. The load carrying capability of this rubber castor is allot higher than normal rubber castors. Softer tread castor tyres are useful for towing equipment and offer good all round performance. They are quite running provide a smooth ride and are kind to floors which can help reduce maintenance costs for worn floors. They are quite running offer great rolling resistance when compared to traditional rubber tyred castors they are also unlikely to damage or mark floors. Very important to remember this is a premium rubber not to be confused with other lower grade alternatives which make claim to similar loads and rolling resistances which are incorrect.