These uncorded foam earplugs offer a soft, low-pressure solution for comfortable wear. Packaged in convenient Refill Bottles to fit your One Touch(TM) dispenser 391-1000 - Large size fits people with larger earcanals - Noise Reduction Rating (NRR)*: 33 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. Leading the Advancement of Hearing Conservation(TM).
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