Pilots need to prepare for the inevitable, which is why picking this 2-pack of Parrot Propellers for ANAFI Ai is essential. If a propeller breaks on your ANAFI Ai, you can quickly and easily replace it and keep flying. Just like the original propellers that come with the ANAFI Ai, their design is inspired by the shape of the fins of humpback whales. In mimicking this shape, the propellers provide increased propulsion efficiency while keeping the same rotation speed. Noise is also reduced with this design, especially from the leading edge of the blade, where the drone emits only 71.5 dB/SPL at 3.3'.