Freefly Astro Max Spare Propeller Set (2270 High Efficiency)Freefly Astro Max Spare Propeller Set (2270 High Efficiency): Balanced carbon fiber blades for maximum endurance The Freefly Astro Max Spare Propeller Set (2270 High Efficiency) provides precision balanced replacement blades engineered to maintain optimal lift and efficiency on the Astro Max platform. Measuring 22 7 inches, these carbon fiber composite propellers deliver the high thrust, rigidity, and aerodynamic performance required for long duration