These uncorded foam earplugs feature soft, slow recovery foam for comfort and outstanding noise reduction. Earplugs are easy to roll down and insert, then expand within the earcanal for a comfortable, secure fit. Refill container for One Touch™ dispenser. One gentle turn delivers uncorded foam earplugs. No packaging waste with each pair 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™