3M™ E-A-R™ Classic™ Metal Detectable earplugs were specially developed for food processing and other industries where it is critical to keep earplugs from contaminating products and processes. Recognized by most metal-sensing systems, these earplugs feature an implanted stainless steel ball bearing in the plug and metal particles in the cord. Benefits •Implanted stainless steel ball bearing is encased in each earplug and metal particles in the cord •Poly bag keeps each pair of earplugs keeps earplugs clean before use •Slow-recovery earplug foam is flame-resistant and water-resistant •Noise Reduction Rating (NRR)*: 33 dB. CSA Class AL. •Test compatible with 3M™ E-A-Rfit™ Validation System.