MACK'S® Hear Plugs pre-molded flanged earplugs. Provide High Fidelity Protection for events such as Concerts, Jam Sessions, Sporting Events, Nightclubs, Shop Work etc. Mack's Hear Plugs use patented filter technology to replicate the natural response of the ear canal so that sound is not muffled and music is heard clearly, but at a safer, reduced volume. The soft flanges enable maximum comfort, while the firm stem allows fast, easy insertion. A noise reduction rating (NRR) of 12 decibels and are fully Washable & Reusable.