Propeller Diameter: 4 inch
Pitch : 2.5
Blades : 2
Material : Poly Carbonate
Hub Diameter : 9.8mm
Adaptor Rings : NO
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HQ do feel solid
HQ makes some great props and these props are no different...
I used these grey wings for garden stake Bee wings & Bird wing that will spin in the wind. They worked ''FANTASTIC'' Thank You,Ron!
Have these for my 4" apex and these things are amazing with the set up I have. I was running the gemfan 4x2.4x3, but these have become my go to