Flat magnetic ring specifically for row line development manufacturing of, each a type size row line, also also has various size of flat shaped magnetic ring. flat shaped magnetic ring it and other cylindrical shaped magnetic ring not as, cylindrical shaped magnetic ring is with in round power line Shang, and flat shaped magnetic ring also only with in row line Shang, each a magnetic ring of development, excellent section are is for using aspects set business and development and manufacturing different type of magnetic ring, for mutual match, to put magnetic ring play out maximum of effect, also can reached solution electronic products interference problem.