These uncorded foam earplugs feature soft, slow-recovery foam for comfort and outstanding noise reduction and exciting flame graphics. Soft foam earplugs are easy to roll down and insert, then expand within the earcanal for a comfortable, secure fit.- Poly bag keeps each pair of earplugs clean before use.- Regular size fits most earcanals.- 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.