Hearos Xtreme Protection Ear Plugs 28 pairs

Xtremely High NRR 33Noise 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.Tested according to ANSI Specs S3.19-1974 The level of noise entering a person’s ear, when hearing protector is worn as directed, is closely approximated by the difference between the A-weighted environmental noise level and the NRR.