Add the Clockwise Propeller Set for Single Alta X Motors from FREEFLY to your gear bag, and you won't be stuck losing valuable shooting time because of a broken propeller. This propeller set features two blades and an ActiveBlade hub, and they are designed to replace the blades/hub on a single boom 2 or 4 motor of the Alta X drone. The blades are balanced clockwise blades, and everything is preinstalled, requiring only M4 fasteners (included) and a bit of Locktite (243 or equivalent) adhesive (not included). The benefit of using ActiveBlade technology is that it's been designed by FREEFLY to reduce vibration loads on the Alta to improve flight performance.