GB Heavy Rail Material: 50Mn, U71Mn Standard: GB2585-81 length:12.5m It is in high quality and resonable price GB Heavy Rail Specification: 38kg/m, 43kg/m, 50kg/m Unit Weight: 38.733kg/m, 44.653kg/m, 51.514kg/m Length: 12.5m Material: 50Mn, U71Mn Standard: GB2585-81