Acrylic
Corrugated plastic (also known as Coraplast) is a fluted polypropylene, made from plastic and reinforced corrugations. Consisting of two thin layers of plastic separated by a hollow rib-like structure, it is a very economical, lightweight, and weather resistant material, suited for both indoor and outdoor use. Used almost exclusively for outdoor promotions, real estate information, and political signage, it is available in many colors.