The characteristics of P.H.T.-VTX Planetary Gear Reducer is the material of unit body is made of Aluminum (full aluminum type: DA and DS Series, part of aluminum type: DH and DL); the advantages of aluminum material on unit body are “Heat Spreading Easily＂, “Weight Reducing than traditional gearbox＂, “Rising the Moving Efficiency＂, and the protection range achieved to IP64 / 65 (IP66 needs to be extra inquired). Comparing for the unit weight of traditional gearbox which made by Casting, Planetary Gear Reducer of P.H.T.-VTX is two-thirds less than traditional gear box on unit weight.