RioRand MG946R High Torque Servo For Motor Helicopter Boat Model Dimension: 40.7x19.7x42.9mm Operating voltage: 4.8-7.2V Stall torque: 10.5kg/cm(4.8V),13kg/cm(6V) Operating speed: 0.20sec/60degree(4.8v); 0.17sec/60degree(6.0v) Compliant with most standard receiver connector: Futaba,Hitec,Sanwa,GWS e