Hitec 31425CR HS-1425CR Continuous Rotation Dual Ball Bearings Servo Motor Type: Cored Metal Brush Bearing Type: Dual Ball Bearing Speed (4.8V/6.0V): 43.4 rpm / 52 rpm Torque oz./in. (4.8V/6.0V): 38.88 / 46.80, Torque kg./cm. (4.8V/6.0V): 2.8 / 3.37 Size in Inches: 1.59 x 0.77 x 1.44, Size in Millimeters: 40.6 x 19.8 x 36.6, Weight ounces: 1.47, Weight grams: 41.7