The smallest that I have in use is 26 gauge wire, and from what I've seen and read tonearm wire gauge is 32, 33 or 34 AWG. That is some seriously small wire.
I know you love that, Navo, but just open your profile and search your posts, or if you have the exact name of the thread or something use a Google query. vB search can be somewhat of a claptrap, even with a talented webmaster.
I just received the wire I ordered from Navo (Dennis)... That is some great stuff at a GREAT PRICE. I paid much more for wire not long ago and with Dennis, you can't go wrong. Don't waste your time elsewhere. This will get a bunch of rewires done (especially my AC. I like to run 16ga).