3M E-A-Rsoft Metal Detectable Corded Earplugs are designed specially for food processing where earplugs are secured from contaminating products. The stainless steel ball bearing is encased in each earplug and the metal particles in the cord. It stimulates full compliance and the bright neon yellow look makes compliance checks easy. Plugs are made of polyurethane foam which offers great attenuation along with low pressure comfort and provides the highest noise reduction rating at 33 dB. The poly bag keeps the plugs clean before use.