Fiber glass material:

Fiber glass, also called glass reinforced plastic, glass fiber-reinforced plastic, or GFRP.,is a fiber reinforced polymer made of a plastic matrix reinforced by the fine fiber of glass. Fiber glass is a lightweight, extremely strong,and robust material. Its bulk strength and weight properties are also very favorable when compared to metals, and it can be easily formed using molding processes. Common uses of fiber glass include boats, automobiles, baths, hot tubs, water tanks, roofing, pipes, cladding and external door skins.