Review on MAS Upgrade Propellers for DJI Phantom 1-3 with Built-in Nut - Green (4 pcs) by Christopher Penn

I have 4 sets of these props and this is by far the best upgrade you can do to your P4 drone. I had the standard propellers loose on one flight and I like the fact that they are bolted on. They happen just as fast, but are much safer. I had no problems and didn't notice any change in flight time. For the safety of spring-loaded standard propellers, they are perfect!