Custom earplugs use special filters as well as molds, that will allow the level of noise reduction to be very precise. This means that you are getting the very best out of your earplug due to the way in which it seals the ear.
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Decibullz Black Custom Molded Earplugs
I spent 3 days in New York with Loop earplugs — and it was delightful
Decibullz top rated DIY Thermo-fit Molded Earpieces combined with Professional Acoustic Filter Technology. Reduce volume 17dB while keeping the sound__ The NEW Decibullz Custom Molded Professional Filters reduce the volume while keeping the sound of the music. These Do It Yourself custom molded earplugs provide a tuned and flat attenuation. This reduces all frequencies by approximately the same level so everything sounds like it is supposed to sound without damaging your hearing.
Decibullz Custom Molded Professional High Fidelity Earplugs Black