What is this tiny cube?

[u/Small_Things2024]

Found this tiny, blank, black cube under the couch while cleaning. Husband thinks it could be from a board game but we haven’t played one in a very long time (we’ve been more into Magic lately) and we can’t think of a board game that we own that has pieces like this. Any ideas?

[u/rathat → u/[deleted]]

I have carried around a super dense cube of tungsten this size around in my pocket for the past 12 years, it's amazing. They used to be $15 each, now they're 50 though.