Flat magnetic ring and said flat shaped magnetic ring, and runway type magnetic ring or row line magnetic ring, called more, many people in these call in the make of disoriented, actually these call are is belongs to a type of, that is flat shaped magnetic ring. regardless of called how variable, it of characteristics and shape cannot variable, said said row line magnetic ring's, why said it for row line magnetic ring, in this aspects, for using flat shaped magnetic ring of people for, knows, no what difficult of, believes everyone see had flat shaped magnetic ring, on it of shape is think is special, Flat shape is not the cable that is matched to that was used on the line, so some people call it a cable loop is not surprising.