@lanx0003 Sorry I don't recall seeing that info about the Optimus cables. You'd probably have to ask them and see if it's something they are willing to share.
Now that I think about it, I don't really notice any trend as far as which materials sound good to me. I like the AQ Vodka and Thunderbird (both silver plated copper) much more than the higher priced Firebird which is pure silver. I didn't care for the Wireworld Platinum Starlight which is pure silver, but I also didn't really like the Nordost and Kimber models I tried which use silver plated copper.
Come to think of it, my three favorites from Veritas, DH Labs, and Voodoo, actually don't specify what they use. Voodoo uses the name "Silverstream" but never tells us what materials it is made from. And DH Labs uses the name "Silversonic" for all their products, even the pure copper designs. So who knows at this point?

