Despite the size of the caster (Ø100 - 200mm), R Series is rated as Light duty type - only 60 - 75 kgs per caster. Rubber tread is just light cushion but will help reduce noise and surface protection.
The bracket is 2.5mm thickness of pressed steel. Japanese Standard Series style , the caster outlook is very attractive with a very shiny Niken coating. Rubber wheel quality is good and very wear resistant.