A pair of HQ 2 bladed propellers, 6" long and with a 5mm center hub. (Package comes with one CW and one CCW prop)
This is the recommended propeller for the Lumenier 2206 2000kv motor and the RR6 Alien.
At first I was getting a lot of theses props. But after breaking a dozen of them I started looking for the PC version. Rotor Riot doesn't carry the PC one, but Piro Flip did. I'll continue to buy parts from RR for sure, but prop wise I'll be going through Piro Flip for props.