DURABLE ALUMINUM CONSTRUCTION: .040″ rust-free aluminum provides durability and resistance to rust. VERSATILE USE: Suitable for laboratories, medical facilities, and industrial sites to mark radiation areas and protect personnel from exposure. HIGH VISIBILITY: Bold text and an international radioactive symbol ensure clear communication of the radiation hazard. EASY INSTALLATION: Pre-drilled holes allow for quick and hassle-free mounting on walls, doors, fences, or posts. BRIMAR GUARANTEE: Made in the USA. Our products are manufactured in our state-of-the-art facility located in Garfield, NJ.