Braked castors with a Pressed Steel castor bracket, fitted with a Polypropylene wheel. These braked casters range from 50mm-100mm and have a capacity up to 100 Kg per caster. Polypropylene or Poly-prop Wheels and castors offer high load capacity compared to many wheel materials. They are light in weight and very hard wearing and good value for money. They can damage painted floors, in this case you would need to use a castor with a tread attached.