Carwires SW9000-20 - 18-AWG 9 Conductor Car Speaker Wire (20 ft.)

Very flexible wire for its size. Each of the 2 joined cables appears to be true 12 AWG stranded wire. My only gripe is that while the round translucent brown cable consists of OFC (copper) strands, the square clear translucent cable appears to be all aluminum. At first I thought it might be tinned copper, which would have been even better. Nope. Just aluminum. No copper at all. Maybe it's not enough to make a noticeable difference, but the positive and negative cables will have different resistance and different voltage drop with a long enough run. For most applications, it probably doesn't really make much difference, but I'm running 1000+ watts rms, so I just doubled up each run. Probably overkill, but that's better than running cable too small or with significantly different resistances.