OEM Classic Uncorded Earplugs from 3M, designed for effective noise reduction with a Noise Reduction Rating (NRR) of 29 dB, classified as CSA Class AL. These disposable earplugs come in a poly bag to keep them clean before use and are both flame-resistant and moisture-resistant. They are also compatible with the 3M E-A-Rfit Validation System for testing.