3M Peltor H7A Deluxe Ear Muffs, 27 dB NRR, Black - Deluxe muffs stand up to high-noise environments: airport runways, construction sites, weapons-testing fields, etc. Liquid- and foam-filled ear cups significantly attenuate both low and high frequencies. Padded headband adjusts to provide a slop-free fit. Assembly is color-coded for compliance sighting.