Still one of the most widely used foam earplugs today, the Classic earplug is an economical, reliable choice in hearing protection and hearing conservation. Slow recovery, low pressure foam conforms to the shape of the earcanal to help create a comfortable, snug noise barrier. Value Pack Dispenser gives you the best value—with savings of up to 20%. Earplugs are not packaged in pairs; 200 pair of bulk earplugs loose in box. 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™.