Speaker cable

I wouldn’t use it, but It’s probably copper Red and Aluminum black. It’s cheap and helps when plugging things in.  Like everyone else, I used lamp cord a hundred years ago and one side was smooth and the other had a line or lines on it. Sort of the same idea.

Chinese don't have anything OCC it's just a scam.

Better quality cable is identical wire quality,  only the connectors are red and black.  This ensures that you match the polarity of both channels. 

This gives you the best bass response. 

That's all. 

Marketing tactics meant to fool the gullible.

Short answer: I don't know.

However DIY enthusiasts on this forum experimented quite a bit with different materials in Helix builds and do use better quality (bare silver or Ohno Cu wire in teflon tube) for one and stranded Ohno Cu for the other. I've been experimenting with these and they are a real improvement, although I didn't try different alternatives within the design. 

Bottom line: I would not discard it makes a difference until I hear them, despite not understanding why this is so (I'm an engineer BTW, so quite familiar with the basics of alternating current).