These Hearos High Fidelity ear plugs use a unique, patented tuned resonator and acoustic resistor to provide flat attenuation in a smaller size than the model 211. The patented design allows you to hear all the highs and lows and the sound is not muffled with an EPA noise reduction rating of 12 decibels when used as directed. These are ideal for performers as well as concert-goers or disco enthusiasts. These improve listening pleasure and reduce discomfort from loud music, and that fatigued and "plugged-up" feeling the next morning. Now you can still enjoy the music and be protected from the harmful effects of highly amplified music. Reusable and washable, and comes with a free case. You or someone you know could benefit from these. Why not make the investment in protecting your hearing or that of someone close to you. Hear for life!