Hearing loss from loud sound affects millions of people but noise-induced hearing loss is preventable! The Saf-T-Ear 20 dB Noise Reduction Earplugs are ready-fit high-fidelity earplugs that reduce sound levels evenly while preserving sound quality and clarity. They replicate the natural response of the ear so sound quality is the same as the original only quieter. Music and voices are clear-not muffled-making them ideal for concerts clubs theaters aircraft construction yard work airshows parades and athletic or motorsports events. The standard size fits the majority of ears. They are reusable but with repeated use the eartips may lose elasticity. For best performance and retention if you use them frequently replace them every 3 to 6 months. They are not recommended for use with impulse noises such as gunfire or for sleeping.