Soft, roll-down foam earplugs conform to the unique shape of each ear canal to provide a low-pressure, comfortable seal. Flexible cord connects earplugs. Poly bag keeps each pair of earplugs clean before use. Soft polyurethane foam earplugs. Noise Reduction Rating (NRR)*: 32 dB. CSA Class AL. *The NRR may overestimate the hearing protection provided during typical use. 3M recommends reducing the NRR by 50% for estimating the amount of noise reduction provided.