With case. Noise Reduction Rating: 33 decibels. Foam air plugs. Tapered for an easy, snug, comfortable seal. Information Required by EPA: The level of noise entering a person's ear, when a hearing protector is worn as directed, is closely approximated by the difference between the A-weighted environmental noise level and the NRR. Example: (1) The environmental noise level as measured at the ear is 92 dBA. (2) The NRR is 33 decibels (dB). (3) The level of noise entering the ear is approximately equal to [92 dB(A) - 33] 59 db(A). Noise Reduction Rating: 33 decibels (when used as directed). The range of noise reduction ratings for existing hearing protectors is approximately 0 to 30 (higher numbers denote greater effectiveness). EPA: Federal law prohibits removal of this label prior to purchase. Label required by US EPA regulation 40 CFR Part 211 Subpart B. Noise Reduction Rating: 33. Lawn Mower: 107 decibels. With Protechs: 74 decibels. Extended exposure to any noise above 85 decibels can cause gradual hearing loss. The highest independently tested NRR. Questions? 1-800-328-2742. Ear plugs made in USA. Case made in China.