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™.