This 125mm nylon castors are made of a zinc plated housing which ensures the castors are robust enough and suitable for a variety of environments. The swivel castors, rotate 360 degrees, along with the white nylon wheel, which is strong robust and durable makes these casters suitable for moving machinery and equipment. The white nylon wheel in these heavy duty castors contains roller bearings making it easier to move whilst maintaining core strength. 125mm Swivel Castors White Nylon Wheel