3M™ E-A-R™ Classic™ corded foam earplugs set the standard in hearing protection as the world's first foam earplugs. Classic™ Plus earplugs are slightly longer than regular E-A-R™ Classic™ earplugs to fit deeper into the earcanal and provide higher noise reduction. Benefits •Classic Plus are longer than Classic earplugs to fit deeper into the earcanal and provide higher noise reduction. •Flame-resistant and moisture-resistant. •Noise Reduction Rating (NRR)*: 33 dB. CSA Class AL. •Test compatible with 3M™ E-A-Rfit™ Validation System