TowerPro MG90S Metal Geared Micro Servo For RC Car Boat Plane Helicopter T-Rex Trex450 x 4 PCS High quality and high cost performance. Metal Gear with less noice. Small size and light weight. 245mm connector wire with 3 sets of servo horns and fittings. TowerPro MG90S Micro Metal Geared Servo x 4 PCS