????

[copperpipe]

well they are magnetic and gave a quarter signal tin disc where with them i have no idea.

 

[Tony Two-Cent]

Core out of some kind of battery? :dontknow:

 

[Full Metal Digger]

Core out of some kind of battery? :dontknow:

Looks like the graphite core of an old battery to me. I think there is zinc and manganese mixed in too.