Keychain whistle suggestions wanted.

SRVCTEC

EDC Master
When we were kids we'd find these steel straps by the railroad tracks and make whistles from them. They were super loud! Anyone else make these?



I'm sure with a nice strip of stainless or titanium and a drill anyone could make a nearly indestructible whistle for next to nothing.
I made this one from stainless a year or more ago. I too had one made from a strap of spring steel as a kid and carried it for over 35 years in my pocket BUT it got kind of gross inside since it would tend to rust. I remember blowing it at ball games and people would turn around and give me "the look" because it is soooo loud and piercing.

 
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