The Crescendo Music is a reusable, universal fit hearing protector designed specifically for musicians and music enthusiasts. The Crescendo Music helps prevent hearing damage at various situations. Crescendo Music reduces the level of sound by 20 dB making music as loud as 105 dB safe to listen to for up to 8 hours.

[Specifications]
[Material] Ear Tip: Medical grade TPE
Filter: Plastic
Place of origin: Netherlands

[Contents] Universal ear tips (L x 2 / M x 2) that fit almost all sizes of the ears
Acoustic filters
Aluminium key-ring carrying case.

Full description in English: Crescendo Official Website