The world`s first foam earplugs and still the most widely used cylindrical earplug today. Packaged in convenient Refill Bottles to fit your One Touch dispenser. • Flame-resistant and moisture-resistant • Noise Reduction Rating (NRR)*: 29 dB CSA Class AL • Test compatible with 3M E-A-Rfit Validation System *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.