The human ear is designed to be able to absorb natural sounds. Because people developed equipment and did inventions, the sound spectrum expanded with a wide range of unnatural sounds that the ear can not properly process. The sensory cells (stereocilia) in the ear degenerate if they are repeatedly exposed to excessive noise. The sensory cells that remained can only transfer part of the sound information. Therefore, a permanent hearing loss is a fact. In the popular speech this is called deafness by noise. Good hearing protection is therefore essential. Good means: not too little, but not too much attenuation.

The hearing protection must also be maintained and worn properly.?

Single use earplugs 303 yellow, size L, polyurethane, a 200 PR
Skin friendly and dirt repellent
Package: dispenser box of 200 pair
Packed a pair in a folded box
Size: L
Material: polyurethane
Attenuation: H=32, M=29, L=29, SNR=33