Features : 450 Class 3D CCPM Electric Helicopter Kit with Brushless motor and ESC. �All metal & fiberglass construction. �Parts are exchangeable with Aligh T-Rex 450 Specification : �Length:650mm �Height:225mm �Main Rotor:710mm ( 325mm blades ) �Tail Rotor:155mm �Motor gear: 13T �Main drive gear: 150T �Small drive gear:106T �Tail drive gear:25T �Weight(without power system):380g �Flight weight: 750g