3M E-A-Rsoft Yellow Neons Corded Earplugs, seal the ear canal with soft, slow-recovery foam for excellent noise reduction and reliable hearing protection. Tapered earplugs are easy to roll down and insert, then expand within the ear canal for a comfortable, secure fit. Earplugs come in a poly bag to keep them clean prior to use. These earplugs have a Noise Reduction Rating (NRR) of 33 dB. Earplugs are made of a polyurethane. Test compatible with 3M E-A-Rfit Validation System. *The NRR may overestimate the hearing protection provided during typical use. 3M recommended reducing the NRR by 50% for estimating the amount of noise reduction provided.