Any cable experts online?? Whose cables are these?

These were on here recently. The people that responded then said they were homemade also.

Where the light is reflecting off of the back of them in photo #1, it makes them look either braided, or shielded. Then in the second photo, it looks like a wire in spiral wrapped around them, at least to me.

I have a headphone extension cable I bought years ago, that has a bad connection in the jack end. When these are used, it sounds just like their plugged in the headphone preamp itself. No added coloration, or loss of anything. I have a generic extension cable that I bought years back that I can't remember where it was from. Both have no markings. The unused spare one sounds so bad, I can't even use it. I think I could buy some discount store one that may sound better, but that's not saying much. I guess I'll just see if I could find a halfway decent jack to fix the old one. I just brought this up because I'd like to find close to, or exact replacement of the original, to have for a spare.