3M e-a-r classic earplugs, uncorded, poly bag, 312-1201, 200 pairs 3M e-a-r classic uncorded 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. 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 and conservation. Slow recovery, low-pressure foam conforms to the shape of the earcanal to help create a comfortable, snug noise barrier. Benefits: poly bag keeps disposable earplugs available flame-resistant and moisture-resistant noise reduction rating nrr: 29 db. Csa class al test compatible with 3M e-a-rfit validation system