Gearbox stepper motor is widely used in equipments which requires low speed and high torque. Smooth had developed cylindric "C" series and planetary "X" series gear stepper motor.according to different driving ways. Smooth gear stepper motors have the characteristics of large transmission rate, and high efficient that is up to 95\%, lower noise and backlash,etc. A huge full range of dimension is from size 8 to size 41(20mm-105mm), the Max. output torque is 40Nm, and the Max reduction Ratio is 1:200.