Hausler 450 PRO Electric Helicopter (Shaft Drive) - New Version 80% of the Kits Components are manufactured from Rigid High Precision Aluminum Alloy Equipped with Three 9g Digital Servos and One 26g Digital Lock Tail Servo Shaft Driven Rotor - No need to adjust Belt Tension Auto-Rotation System and CNC Metal Tail Unit and Tail Holder are Manufactured from Rigid Aluminum, Giving a Greater Lifespan and Reliability Carbon Fiber Main Blades