3M 7000009666 earmuffs provide excellent hearing protection with an attenuation rating of 21.0 decibels. Designed in an earmuff style, they offer a comfortable fit and are worn behind the head. They also come with noise attenuating headsets for added convenience. Although they do not have metal detectable or moisture resistant properties, they are CSA Class B certified. These non-corded earmuffs are not electrically insulated or dielectric, but they do offer reliable and durable performance. Stay protected with 3M's high-quality earmuffs.