... -12V 2.Speed&Torque :10-2000RPM,1:10 to 1:1000 Ratio 3. Stall torque high to 5kg.cm 4. ... ,Automatic Door Lock, ToysReduction Ratio 1:10,1:20,1:30, 1:50, 1:63,1:100,1:150, 1:2101:250,1:298,1:380,1:1000Specification: ModelReduction RatioVoltageNo LoadAt Maximum ... contact with me if any more questions.. 6v 12mm diameter 1:10 to 1:1000 ratio 10 to 3000rpm micro metal gear motor