RioRand MG995 High Speed Digital Metal Gear 2BB Torque RC Servo for HPI Savage XL FUTABA Powered by RioRand Advanced Technology Size:40*20*37mm Operation Voltage: 4.8-6V Stall Torque (4.8V): (13kg/cm) (180oz/in.) Stall Torque (6.0V): (15kg/cm) (208oz/in.)