MAX Ear Plugs are disposable foam ear plugs that feature a smooth outer skin for maximum user comfort. The NRR 33 rating makes MAX ear plugs the highest rated ear plug in the U.S. The smooth, soil-resistant skin of Max ear plugs help prevent foreign material from penetrating the surface while rolling prior to insertion. Max ear plugs are attenuation tested in accordance with ANSI S3.19- 1974. Noise reduction rating NRR 33 dB, SNR 34 dB.