The T'boli also use sections of tin sheet on their scabbards. It is stiffer than aluminum and can give a nasty cut/scratch. I can see some sharp points where the edges meet. Perhaps tin rather than aluminum? During WWII, U.S. bulk foods (grains, beans, flour, salt, sugar, cooking oil, etc.) often came in large tin containers that got cut up and reused for other purposes. Just a thought.
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