These uncorded foam earplugs offer a soft, low pressure solution for comfortable wear Poly bag keeps earplugs clean before use. Large size fits people with larger earcanals Soft foam earplugs are easy to roll down and insert, then expand within the earcanal to help reduce noise exposure Noise Reduction Rating (NRR)* 33 dB. 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™.