High-precision mold, no small holes on the outside, no pulling. Wear- and -: Worry-free use in harsh wind and sand environments Low water absorption: High temperature 80, high humidity (85% humidity), can also be used stably Usage environment: -40-80 Notes: (1) Specifications: CCW: "CCW" is marked after the propeller model. When in use, the propeller and the motor rotate counterclockwise (looking down); "U" is the upper propeller wing, and "L" is the lower propeller wing. (2) The propeller is made of strong and tough material. If it touches unprotected parts of the human body when rotating at high speed, it cause great harm. Please use it with caution. (3) The structural strength of the propeller has been fully tested. Please use it reasonably within the recommended maximum tension range. If the maximum tension is exceeded, the blades be damaged. Please do not test the strength of the blades by bending them with your bare hands. This method is very different from the actual force during flight and may also cause damage to the blades. (4) Before use, please carefully check whether the cover screws are installed in place. The propeller must be installed in place. (5) When the propeller is installed on the motor, be sure to apply anaerobic screw glue with medium strength or above on the mounting screws. Color: Black Material: Carbon Fiber + Resin Package Contents: 2 x Propeller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.