Blades are made of Aerospace grade, uni-directional carbon fiber (Smoother and far quieter than wood, plastic, injection molded or fiberglass reinforced blades, Unlike these blades that bend and flutter, ),shape designed by computer system,blade still move in low wind speed,light weight(0.8kg only each piece),the blade surface is the same hard as steel, means no flutter, low noise, more energy,The blade will not break even in the strong wind.