The 3M E-A-R Classic uncorded earplugs set the standard in hearing protection as the world s first foam earplugs. Designed with a slow-recovery low-pressure foam conforms to the shape of the earcanal to help create a comfortable snug noise barrier. These disposable earplugs are uniquely moisture-resistant and are still one of the most widely used foam earplugs today. This earplug is an economical reliable choice in hearing conservation & protection. Style: 3M E-A-R Classic Uncorded Earplugs Hearing Conservation 312-1201 Poly bag keeps disposable earplugs available. Flame-resistant and moisture-resistant Noise Reduction Rating (NRR)*: 29 dB. CSA Class AL *** 200 PAIRS PER BOX ***.