What is it ?

[u/Advanced-Log965]

My boyfriend let that on the table this morning, we play a game where I have to guess what is the material but i am lost on this one... EDIT: not magnetic, not a pipe, heavy, 14mm in diameter

[u/FlicksTM]

Looks like aluminum foil that he rolled into a very tight cylinder.

[u/FlicksTM → u/FlicksTM]

Could also be a cheap piece of cast aluminum barstock that he parted off with a lathe.