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.
Although the R Series is designed not to withstand much load capacity as the B Series but R Series casters are still capable of 30 kgs per caster. Good PP wheel is hard to break and very wear resistant.