Made from hypo-allergenic polyurethane foam, Model E2 IHP532C has tapered design that provides secure, comfortable fit with noise reduction rating of 32. Corded and bright blue, earplugs also have embedded brass ball that allows for visual and automatic detection. Brass ball in center of earplug is securely encased in foam with no exposed metal. They come in dispenser packages of 200 pairs, each individually wrapped.