Covering silver wire for use as a speaker cable

I've read somewhere that they've tried wrapping with plumber's teflon tape before a more solid outer layer, like shrink tape. The yellow gas tape is thicker and less prone to tear. I don't suggest separating +/- for any extended length, so we're talking about layers of insulation.

Silver and copper ...

http://www.ultimatecables.com/

Also happens to be why I wouldn't bother making speaker cables.