pt model carbon 20x8 propellerPT Models Carbon props are molded from high quality epoxy resins and woven carbon fiber cloth, which are certified for use in full size aircraft. These propellers are supplied factory balanced and excel in lightness, rigidity and low noise. 10mm bored hole in the center for gasoline petrol engines. PT high performance propellers from the Czech Republic feature hollow molded blades fabricated from unidirectional and bi directional carbon fiber and