This is a set of two 8" propellers for the DJI Phantom quad copter V1.1.1. It includes one clockwise (CW) and one counter-clockwise (CCW) rotating propeller, two props total. The self-tightening design with integrated prop nuts means no propeller loss during flight due to loose prop nuts. To see if your Phantom is compatible, please verify that two of your Phantom"s motors include black dots at the top of the thread post. If your motor"s posts don"t include these special marks, you can purchase separate motor upgrades and change these two motors to be compatible with self-tightening props or purchase non-self-tightening props identical to the ones originally included with your Phantom.