Hitec RCD 31425S HS-425BB Pro BB Servo Speed (4.8V/6.0V): 0.21/0.16 sec @ 60 degree Torque oz./in. (4.8V/6.0V): 46/57, Torque kg./cm. (4.8V/6.0V): 3.3/4.1 Size in Inches: 1.59x0.77x1.44, Size in Millimeters: 40.39x19.56x36.58 Weight ounces: 1.60, Weight grams: 45.36