Just acceptable quality: steel bracket is thin and average wheel quality. The caster is not too durable as it has only one ball bearing raceway in swivel head so if overload or by foreign force the bearing ball may fall out.
Superior than most of small China caster, better steel & wheel quality. So the caster is definitely has higher load capacity and last longer. In Light duty Series of Gia Cuong Thinh, plastic casters are preferred over rubber casters.