Uncorded ear plugs are packaged in convenient refill bottles to fit your 3M One Touch Dispenser 391-1000. Slow-recovery foam provides a comfortable, effective seal while exerting low pressure in your ear canal. PVC ear plugs fit a wide range of ear canals. Once in the ear, foam plugs expand to provide a snug & secure custom fit. They are flame-resistant & moisture-resistant. The Noise Reduction Rating (NRR) is 29 decibels CSA Class A. Ear plugs are recommended for various industries including automotive, commercial buildings, construction, design & construction, general manufacturing, heavy infrastructure, industrial maintenance, metal fabrication, military maintenance, repair & operation (MRO), mining, oil & gas, pharmaceutical & transportation.