I have a bi-wire set. They're about 3/8" diameter, and a red & black wire emerge from the ends. Seems like they're twisted around a core inside the jacket. I'm not sure they're Litz though (but I haven't checked closely). These speaker wires weren't too expensive.
Let me know if you want to sell yours, I could use a matching set for my new Center channel!
Let me know if you want to sell yours, I could use a matching set for my new Center channel!