This corded foam earplug feature a bell shape and super-soft, slow-recovery foam to effectively seal the earcanal and provide reliable hearing protection. - Poly bag keeps each pair of earplugs clean before use - Bell shape allows easy fitting and removal. - Noise Reduction Rating (NRR)*: 33 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™.