These DJI E600 Self Tightening Propellers Black with Yellow Stripes are specially designed to be used with the DJI E600 Tuned Propulsion System, they have a built in nut with threads to allow self tightening while in flight, they require a special spanner to undo them after flight. Please note that these props will only work with the right and left handed threaded motors. Packet Contents: 2 x (12 x 4.2 inch) E600 Tuned Propulsion System propellers: 1 x CCW propeller, 1 CW propeller in Black with Yellow Stripes (Black and Silver caps).

The DJI E600 propellers are dynamically balanced at the factory which removes the jello effect seen on video taken from the camera when airboure, the low inertia and aerodynamic efficiency of the E600 propellers means that you can use higher gain values to deliver a great level of maneuverability & stability from your flight controller.