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™.