Small neck chain on which to attach a pendant-type-thing

Hello, I have this necklace that I thrifted that is literally just a retro "token to ride" for a defunct Pittsburgh train company that has a cheap ass probably aluminum or similar material chain threaded through one of the holes. The little links in the necklace are constantly coming apart and I am on the verge of exploding about it, I need to find a replacement. I am completely unfamiliar with this stuff, what recommendations or at least words do I use to look for something like this. The one requirement I have is that it has to be very small if I'm going to thread it through the hole in the token, or I'll need to come up with some new way to attach it. I'm not particularly invested in it being a nice metal as long as the construction holds up, if anything I feel like nicer materials would be a mismatch given that the token itself is nothing special.
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