Our traffic signs are heavy duty .080" thick aluminum with an Engineer-Grade Reflective surface. This provides additional visibility in low-light conditions and dark areas when light is directed at the sign. Sign is screen-printed with UV-resistant inks to prevent fading. Aluminum provides the strength and durability of metal, yet does not rust. It has superior abrasion, corrosion and chemical resistant. This sign can last for years indoors and outdoors withstanding the harshest weather conditions.