The BO Motor gives good torque and rpm at lower operating voltages, which is the biggest advantage of these motors. A small shaft with matching wheels gives an optimized design for your application or robot. Mounting holes on the body & lightweight makes it suitable for in-circuit placement. This motor can be used with a 69mm Diameter Wheel for Plastic Gear Motors. It is an alternative to our metal gear DC motors. It comes with an operating voltage of 3-12V and is perfect for building small and medium robots. BO MOTOR SINGLE SHAFT Low density: lightweight, low inertia. Capability to absorb shock and vibration as a result of elastic compliance. Ability to operate with minimum or no lubrication, due to inherent lubricity. The relatively low coefficient of friction. Operating Voltage(VDC): 3~12 Shaft Length (mm): 8.5