MU-20138 Unique 4 layer cut off design enhances the sound-insulated effect. Front end spatial design fits ear channel to reduces ear internal pressure for wearer comfort, and reusable ear plugs. Terminal stem molded-in non-slip use for easy insertion into ear canal. Also provide other options: with cord or plastic box. SNR 28dB, NRR 27dB, ANSI S12.42/S3.19, CE EN352-2, rubber material, made in Taiwan, and certified by American and European standards.
