This is a nice, premium product, Made in USA. Thick UV resistant 3 blades and hub designed for our Cutting Edge Power Cyclone Wind Turbine. It is sized to fit an 3/16" diameter shaft. It is press fit on with 3 set screws included to lock the blade to the shaft. This blades are tested in a real engineering wind tunnel. Aerodynamic grooves on the blades create a thin turbulent boundary layer on the surface, which allows the blade to flow smoothly through the wind.
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*Charging data determined by actual test results in an engineering wind tunnel. Your results may vary depending on wind velocity, wind direction and other factors.