Uncorded ear plugs are packaged in convenient refill bottles to fit your 3M One Touch dispenser 391-1000. Slow-recovery tapered foam provides a comfortable effective seal while exerting low pressure in 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. The Noise Reduction Rating (NRR) is 33 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.