Whether you're on a track day, stuck at the road side or just out and about, this compact, but loud whistle should come in use at some point!
This is a nice addition to the keys of a Seat or Cupra fan, or anyone that wants a whistle... The twin tone barrels create a loud sound with minimal effort.
I've not tested the sound with metals, only plastics but the sound shouldn't differ much as the sound is created by air, not resonance of the material.
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With some prints there may be some power left in the chamber or in the small slit on the mouthpiece. If there is powder left use a paper clip to dig it out, and for me I find some thread to floss the small mouthpiece slit works well. It sounds like a faff, but it only takes a moment!