Despite the size of the caster (Ø100 - 200mm), R Series is rated as Light duty type - only 60 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.