Hearos Ear Plugs, Ultimate Softness Series 20 pairs

20 Pair Bulk Pack Super Soft Foam High NRR 32dB Noise Reduction Rating: 32 Decibels (when used as directed) The range of noise reduction ratings is for existing hearing protectors is approximately 0 to 30 (higher numbers denote greater effectiveness)Testing according to ANSI Specs S3.19-1974: The level of noise entering a person-s ear, when hearing protector is worn as direct, 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 decibels dB(A). 2. The NRR is 32 decibels (dB). 3. The level of the noise entering the ear is approximately 60 dB(A)