Why I don't use the Low-Noise Propellers anymore! - AirBuzz.One Drone Blog
Master Airscrew Propellers - STEALTH propellers for the DJI Spark are here! Our non-folding prop design produces less noise, provides better stability, and the vibrant colors offer better in-flight visibility. They are
for DJI Spark 4732S Propellers Drone Quick Release Propeller CW CCW Wing fan Low Noise Props Drone Accessories
Low Noise Propellers for the DJI Spark from Master Airscrew! Quick Review & Demo. - YouTube