Mack's Foam Earplugs, 3 pair, are molded with state-of-the-art, super low-pressure, high noise reduction foam. Feature a high noise reduction rating (NRR) of 32 decibels, this high performance hearing protection can be used in environments where noise is just a nuisance up to environments with hazardous noise levels. Protect your ears with Mack's Ultra Soft Foam Earplugs.