RioRand 2 Pcs SG90 9G micro small servo motor RC Robot Helicopter for Helicopter Airplane Boat Controls Powered by RioRand Advanced Technology coreless motor,Dead Band Width : 2 usec Stall Torque : 1.5kg/cm at 4.8V Voltage : 3.0 - 7.2Volts Dimension : 22mm x 12mm x 29mm