High hardness and wear-resistant ceramic bearings are used, which are more wear-resistant than the previous graphite bushings Stainless steel impeller design, good toughness, high hardness, effective operation and noise control Tun copper coil, using multi-position balanced winding to make the voltage more stable The ceramics are made of high-precision ceramics with low noise The shell is made of environmentally friendly space aluminum with deep oxidation treatment on the surface, which is not easy to rust and fade, Manufacturer: MERHOVO