3M PELTOR, Hard Hat-Mounted Earmuff, 23 dB NRR, Electronic Ear Muffs - 52WZ26|HRXS221P3E-NA - Grainger
3M Peltor MT7H79F-FM-50 MT Series FM Two-Way Radio Headset, Intrinsically Safe (NRR 25) - 3M Peltor MT Series High Noise Two-Way Radio Headsets (NRR 25)