Our 150mm Rebound Rubber Wheel Richmond Castor  is in the series of industrial castors. The wheel runs on Ball Bearings and the diameter of the wheel is 150mm (6″). This heavy duty castor has a load capacity of 225kg. This castors frame is a swivel frame which allows the castor to swivel or rotate 360°. Rebound rubber wheels are non marking however they have a higher rolling resistance than some other wheel types.