Agreed, Make sure its silicon and highly flexible. I bought some silicone wire from eBay and it turned out to be 16 stranded steel wire in a silicon coating. Wasn't too impressed. Should have stuck with a turnigy branded silicone wire, at least i would have got the right stuff.

That above eBay link is a good one as they list the strand count, being 680 for 12AWG. so thats the good stuff