Feature a stainless steel ball bearing in the earplug and metal particles in the cord to aid in locating the earplug if lost. Metal detectable foam earplugs were developed for food processing and other industries where it is critical to keep earplugs from contaminating products and processes. These earplugs seal the ear canal with soft, slow recovery foam for excellent noise reduction and reliable hearing protection. Recommended applications include chipping, chiseling, drilling, furnace operations, grinding, heavy equipment operations, machining, pouring\/casting, power fastening, riveting, sanding, sawing and welding.