This is a balanced counter-clockwise replacement prop set for a single motor. It includes the  hub (for legacy motors with M3 fasteners* on booms 1 or 3), a pre-installed balanced prop set and replacement fasteners. 

ActiveBlade compensates for the dissymmetry of lift and cyclic loading as the Alta blasts across the sky. In our testing ActiveBlade reduced peak vibration levels to 1/5th of their normal level which allows for better flight performance and reliability.

Reference the  Maintenance section for instructions for removing and installing replacement prop sets.**

*If you already own an Alta X, refer to the product images for motor reference to make sure these fit your the motors. If your motors DO NOT say "M12" on the top, your CW ActiveBlade replacement is . 

**Alta X props with orange tips are interchangeable with non-orange tip props.