There are three reduction gear motors of different speed and you can choose the one you need.
Small speed reducing motor with metal increases torque.
Gear motors are primarily used to reduce speed in a series of gears, which in turn creates more torque.
Full metal gears would ensure a longer service life, high torque and less noise. Mini dc gear motor is small and lightweight to easily mount a wheel on the motor's output shaft or copter blade.
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Specifications:
Voltage: DC 12V
Speed: 100RPM, 200RPM, 2000RPM(Optional)
Output Shaft Diameter: 3mm / 0.12"
Output Shaft Length: 20mm / 0.78"
Color: As the pictures show