Perfect for Hi-Power RC Boats, RC Cars, Robots, School Projects, and Other Hobby Projects. 600 Max. RPM Ball Bearing. Quiet Operation. 1:10 Gear Motor and High Torqure same as 8W motor. Exceptional Speed Control. Torque: 0.7 Lb-InchHorse Power Cont.0.8 WLength of Motor (excluding spindle)50 mmGear Ratio Torque 1:10 0.7 Lb-Inch Diameter of Motor25 mmVoltage & Current12 V DCLength of Spindle9mmRPM600Diameter of Spindle (with a flat )4 mmReversibilityReversibleWeight per Motor3 oz