M6 Earmuffs, High quality, robust Ear Muff. Particularly high attenuation at 35 dB [SNR]. Light and flexible, with low contact pressure. Comfort cushions made from viscoelastic foam. Ribbed air cushions for cool comfort. Plain surface for easy cleaning. We suggest to replace the cushions & foam inserts every 6 months [Part No 6135], Tested and certified to EN 352-1:2002