LEANINGTECH 4 x MG90S Micro Metal Geared Servo High Speed for RC Helicopter Plane Car Boat Reaction Speed: 0.11 seconds / 60 degrees (4.8V) 4 xLEANINGTECH MG90S Aluminum Metal Gear Servo Working Torque: 2KG/cm; Product size: 22.8 * 12.2 * 28.5mm Structural Material: Aluminum metal teeth, coreless motor, double ball bearin Applying to the model of fixed Wing, helicopter KT, glide, small scale robot, manipulator.etc