JMT Servo Set: 3 Pcs KDS 2004-8 9g + KDS N590 Digital Tail for 450c 450s 450sv Trex 450 Rc Heli Airplane Upgrade Servo set: 3 pcs KDS 2004-1 9g + KDS N590 Digital Tail For 450C 450S 450SV TREX 450 RC heli airplane Upgrade