Just as a follow up. I now have four pairs in my system, replacing interconnects that cost $125, $325 and $1,940 each. I am very happy with the Oritek X-1 cables. Not perfect, the cables they replaced did certain things better, but all-in-all, I'm quite pleased with them. Very detailed, dynamic, and accurate bass. Somewhat flatter images but the soundstage itself is still 3-dimensional although a little further back. Extremely clear. I don't know their construction but if I had to guess, I'd say copper or silver-plated copper. My previous cables were pure silver and the one between my preamp and amp (the $1,940 unit) was metal over plastic.
Highly recommended.
Joe