Skin Effect Explained. Why many fine strands (the finer the better) are better than fewer (or one) strand(s). Hobby wire (good hobby wire) is more costly than your garden variety speaker and automotive wire because of it’s higher strand count and surface area. Particularly between an ESC and Motor. Read more:
Twisted-wire Conductor & Skin Effect
This is why we stock high strand count silicone insulated wire rather than the cheap stuff.