The Mi Electric Shaver S500 Replacement Head adopts a double-ring knife net and double-layer blade design. It is 50% more than the single-ring knife net and enters the double beard once. The inner and outer rings have a total of 15 blades that work together to quickly shave the beard. The cutter head nets are made of high-quality imported steel. The knife net is round and smooth, and the blade is sharp and wear-resistant. The use of ECM electrochemical machining in the field of precision medical devices to process blades and knives not only reduces the occurrence of metal burrs but also greatly improves the wear resistance of the tools. The three sets of blades have good flatness and high fit with the knife net.