My first guess was a high density metallic polymer plastic. This one is actually interesting for reasons beyond what it could be We have a made in China stamp A made in the USA label And a Japanese recycling sticker :facepalm:
So let’s break this down since the normal methods won’t work. You did the most important— magnet test. Moving on. Drop it from 3 or 4 feet. Preferably onto concrete. A thud with no reverb is a plastic A clang is aluminium A thump is magnesium or manganese. The 2 Ms. I can’t rule it out from a photo but I’m not thinking Al here because no matter how it’s manufactured Al always produces “lines”. I’m not seeing it here.
My thought Is either a very dense plastic or manganese. If you want to know for sure, and you have a vice you can lock it in and hit one of the sides with a hammer to crack or break it. The inside section would tell me instantly in most cases.
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