Product Description Poly bag keeps earplugs clean before use. 100 pair/box Blue stem makes insertion and removal cleaner and easier. Test compatible with 3M™ E-A-Rfit™ Validation System Noise Reduction Rating (NRR)* 28 dB. CSA Class AL. 3M™ E-A-R™ Push-Ins™ earplugs provide all-day hearing comfort, convenience and protection. Constructed of 3M™ E-A-Rform™ foam, these earplugs feature a no roll-down design and a blue stem for a quick and easy fit. These push-to-fit, corded foam uncorded earplugs are easy to use again and again, reducing waste. Proprietary no roll-down - Poly bag keeps earplugs clean before use - Blue stem makes fitting and removal cleaner and easier. - Noise Reduction Rating (NRR)*: 28 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™.