
Wind turbine materials vary based on the style of turbine in use, and the location it will be situated in. the mast of a typical turbine is metal, usually steel. It also makes up the majority of the mass of the turbine. Atop the mast sits the turbine itself, which is connected to the blades of the windmill via a gearbox and a short axle.
The largest concentration of weight is the gearbox area, though its small size relative to the mast means that it comes second in overall weight. The final portion of a wind mill is the blades themselves. They use lightweight but strong wind turbine materials to get props that are easy to move yet hard to break. The most common blade material is fiberglass.
Fiberglass makes for one of a few excellent wind turbine materials because it has a high structural integrity coupled with a low weight. Almost as importantly, it is not inordinately expensive to create. Carbon Fiber is lighter and stronger than fiberglass, but it costs much more. If it were an economically viable alternative, we would see carbon fiber windmills all over the place.