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Just milled metal. Lots of less fancy ways. My personal punk rock version is just hammered washers. You can 3d print a jig to keep it clean too.
https://blockmit.com/english/guides/diy/make-cold-wallet-washers/
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I thought about this method. It costs around $3 in my country if you already have hammer and stapms
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I totally support you. It's great we study Bitcoin. But I don't have a plan to take Bitcoin to the grave that's why I should teach people around me
btw, checked your storage device. It looks fancy. I'm curious, is it possible to make it myself...