These specially designed acoustic filters reduce sounds evenly across a wide frequency range. The filters allow you to turn down the volume (noise) without sacrificing listening quality (the sounds you want to hear – warning signals, speech, etc.). 
 
 
Features: 
Natural sound clarity and speech intelligibility
Re-usable hearing protection, universal fit and easy to fit.
Awareness of your surroundings – hear warning shouts and alarms and direction of sound
NRR 11
Retention cords