... parts include lubricating oil, oil seals, and bearings.6.Low NoiseAll key components are finished by precisely machining, accurate assembly ... , and finally tested, and therefore, fairly low noise is reached.7.High EfficiencyThe efficiency of gear unit can reach 95 ... don't hesitate to contact me. Plastic reducer/gear motor with high quality/(PVC, PP, PE, PA, PC, ABS .etc)Series ...