MFR Series Metal Film Resistors YAGEO MFR Series Metal Film Resistors feature a power rating range of 1/6W to 3W and a resistance tolerance range of ±0.5% to ±5%. These resistors are manufactured using a vacuum sputtering system to deposit multiple layers of mixed metal alloys and passivated materials onto a carefully treated high-grade ceramic substrate. After a helical groove has been cut in the resistive layer, tinned connecting leads of electrolytic copper are welded to the end-caps. YAGEO MFR Metal Film Resistors are coated with layers of blue lacquer.