This uncorded foam earplug features 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 available or accessible for re use. Flanged end allows easy insertion 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™.