Align 520 Carbon Fiber Blades (3-Blade Set)The Tri Blade 520mm Rotor Blades from Align are designed for use with T Rex 550 tri blade setups and other helicopters that use tri blade rotor heads. These blades are made from high quality materials and are engineered to provide improved stability, performance, and precision during flight. The 520mm size of these blades is a common size for larger helicopters, providing ample lifting power and stability. Additionally, tri blade rotor heads provide