These E-A-R™ Classic™ SuperFit™ earplugs feature an orange "fitting ring" that provides a guideline for proper fitting and a quick visual compliance check. Packaged in convenient Refill Bottles to fit your One Touch™ dispenser 391-1000. Benefits •Packaged in convenient Refill Bottles to fit your One Touch™ dispenser 391-1000 •Conforms to the shape of the earcanal to help create a comfortable, snug noise barrier •Slow-recovery earplug foam is flame-resistant and moisture-resistant •Noise Reduction Rating (NRR)*: 30dB. * Test compatible with 3M™ E-A-Rfit™ Validation System.