SMAKN&Acirc; MG946R Metal Gear MG946 13KG Torque Digital Servo For RC Car Boat Helicopter Brand new and high quality. High speed, stable and shock proof. Stall Torque: 10.5 kg / cm (4.8V), 13.0 kg / cm (6.0V). Operating Speed: 0.20 sec/60 (4.8V), 0.17 sec / 60 (6.0V) Operating voltage: 4.8 - 7.2V.