Editorial Review These reusable earplugs provide comfortable hearing protection; replace every 3 to 6 months, depending upon use. The grip stems allow hygienic insertion. A carrying case and attached polymer cord help prevent loss. Ear Plugs, Reusable, Corded, 100 Pairs Per Package, Noise Reduction Rating NRR 27dB, Metal Detectable No, Ear Plug Size Universal, Ear Plug Shape Flanged, Ear Plug Color Yellow, Ear Plug Material Soft Plastic, Cord/Band Color Blue/Yellow, Cord/Band Material PVC, Ear Plug Packaging Carrying Case, Standards ANSI S3.19-1974 Tested, Includes (100) Pair of Earplugs, Package Quantity 100