IPS-Twin Power System Weight: 42 grams / 1.50 oz. Gear ratio: 106T / 9T = 11.8 Recommended battery is 7.2V (2/3 AA 270 to 600 mAh). Using higher than 7.2 Volts will greatly decrease the lifetime of each motor. Using two heat sinks will extend both motor lifetimes. CAUTION: Using a larger than recommended propeller and/or higher voltage battery may cause permanent damage to this motor. Recommended Propellers:14 x 10, 15 x 7.5, 15 x 10. Recommended Batteries: NiCAD 6.0V - 150mah GWS, NiCAD 7.2V - 350mah GWS NiCAD 8.4V - 350mah GWS