This is the Blue and Black Propeller Set for the Dromida Ominus Quadcopter FPV, DIDE02**. Flexible plastic construction withstands crashes Two Blue and two Black Propellers, key #2 Four Screws When replacing propellers the color props must be installed at the front, and the black props must be installed at the rear following instructions in the manual. Prop colors also correspond to body colors; Blue, DIDE02BB Red, DIDE02RR Green, DIDE02GG Yellow, DIDE02YY jxs 03/05/15 ir/jxs &