"A mil is a thousandth of an inch — .001 inch. It is a typical manufacturing dimension."

https://www.deeproot.com/blog/blog-entries/mil-thickness-what-does-it-mean-and-how-do-i-measure-it

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now