Heavy duty with good quality PU tread on firm cast-iron core. The caster is made to operate continuously, it also has greases nipples on bracket steel & wheel's cast-iron core. This makes easy maintenance.
6.0 mm thickness steel bracket combines with Korean style Cast-iron core PU wheel. This wheel is round so it will move and rotate much easier compare to the normal flat American version. Plastic cover hubs and grease nipple are equipped.