Soft, smooth, bell shaped foam earplugs roll down easily then expand in the earcanal to provide comfortable hearing protection. Poly bag keeps each pair of earplugs clean before use. Ideal for smaller earcanals Noise Reduction Rating (NRR)* 28 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™.