The Hocks Noise Braker protects your hearing by using a Law of Physics, "The Accelerated Resonant Decay Principle". Which means, "One cannot create or destroy energy, but energy can be converted from one form to another. 

The Hocks Noise Braker Filter converts sonic energy into thermal energy by means of compression acceleration. The rise in temperature is so minute one never notices. Thus one can still hear, while dangerous levels of sound are blocked by the filter. 

Features:
- A practical way to guarantee against excessive noise exposure, which can be damaging.
- Ideal for loud work and social environments, such as Airports, NASCAR, Music Concerts, Etc...
- NRR-19