Soft, roll-down foam earplugs expand to fit the earcanal and provide a low-pressure, comfortable seal. - Poly bag keeps each pair of earplugs clean before use.- Noise Reduction Rating (NRR)*: 32 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™.