3M™ E-A-R™ Classic™ corded earplugs set the standard in hearing protection as the world's first foam earplugs. Constructed from slow-recovery foam, these disposable earplugs are uniquely moisture-resistant. Benefits •Econopack gives you the best value—with savings of up to 20%. •Flame-resistant and moisture-resistant. •Test compatible with 3M™ E-A-Rfit™ Validation System. •Noise Reduction Rating (NRR)*: 29 dB. CSA Class AL