Polymer formulation gently hugs the earcanal to provide an effective seal that protects against noise. Ergonomic pistol grip for an easier fit Triple flange provides proven protection without rolling or touching plug during insertion. Conforms well to the ear's natural oval shape. Washable and reusable. Corded Earplugs Noise Reduction Rating (NRR)*: 27 dB. CSA Class AL *The NRR may overestimate the hearing protection provided during typical use. 3M recommends reducing the NRR by 50% for estimating the amount of noise reduction provided. 3M is Leading the Advancement of Hearing Conservation™.