Align T-Rex 500XT Top Combo Helicopter Kit (Torque Tube) w/BeastX Plus, Motor, ESC, Servos, & CF BladesEquipped with all the top end electronic devices, T REX 500XT is as stable and powerful as the large scale helicopters. It's redefining 500 class helicopters. T REX 500XT now uses 470mm main blades and 520MX(1600KV 3527) motor with 20% more power than the original 1600KV 3225 motor. The latest RCE BL80X Brushless ESC support dual BEC output from 6 ~ 8. 4V providing outstanding power. The new DS530M DS535M digital servos have extreme torque and faster