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 and secure custom fit. They are flame-resistant and 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 and construction, general manufacturing, heavy infrastructure, industrial maintenance, metal fabrication, military maintenance, repair and operation (MRO), mining, oil and gas, pharmaceutical and transportation.