This is a nice, premium product, Made in USA. Thick UV resistant 5 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 5 set screws included to lock the blade to the shaft. These blades are tested in an 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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I haven't had a chance to put this in action yet, but I'm impressed with the craftsmanship - looks to be 3D printed? My concern at the moment is the tiny screws that fasten to the shaft on the turbine. I don't know how you could make these more accessible and less prone to wear inside the plastic, but I'm concerned that repetitive loosening and tightening will quickly wear out the fasteners. I want to take this with me while car camping and when I remove the hub for storage it may be susceptible to wear damage.