Still one of the most widely used foam earplugs today, the 3M™ E A R™ Classic™ earplug is an economical, reliable choice in hearing protection. Reusable Pillow Pack helps keep earplugs clean when they are not being worn. Conforms to the shape of the earcanal to help create a comfortable, snug noise barrier Slow recovery earplug foam is flame resistant and moisture resistant Noise Reduction Rating (NRR)*: 29 dB. CSA Class AL. Test compatible with 3M™ E A Rfit™ Validation System. *The NRR may overestimate the hearing protection provided during typical use. 3M recommends reducing the NRR by 50% for estimating the amount of noise reduction provided. 3M is Leading the Advancement of Hearing Conservation™.