These uncorded foam earplugs offer a soft, low pressure solution for comfortable wear. Packaged in convenient Refill Bottles to fit your One Touch™ dispenser 391 1000. Refill container for One Touch™ dispenser. One gentle turn delivers uncorded foam earplugs. Regular size fits most earcanals. Shaped, self adjusting foam provides a comfortable, low pressure seal. Soft foam earplugs are easy to roll down and insert, then expand within the earcanal for maximum comfort. Noise Reduction Rating (NRR)*: 33dB. CSA Class AL. Test compatible with 3M™ E A Rfit™ Validation System *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. 3M is Leading the Advancement of Hearing Conservation™.