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.. Pulpable paper packaging. Benefits •Pulpable paper packaging is ideal for pulp and paper industries. •Flame-resistant and moisture-resistant •Noise Reduction Rating (NRR)* 29 dB. CSA Class AL. •Test compatible with 3M™ E-A-Rfit™ Validation System.