ThurstonX
Headphoneus Supremus
Nah, HFM has SPC cables before, those are the stiff ones packaged with HE500. These are supposedly quite different.
In the Hifiman press release, these cables are "Newly-designed cable of Crystalline metal featuring Oxygen-free copper and Oxygen-free silver" whatever that means.
In the DIY cable thread someone asked about a plusSounds wire:
http://www.plussoundaudio.com/diy/wires.html
It's the next to last on that page and ain't cheap. Their version is cryo-treated, so maybe it's different from HFM's, but the plusSounds is clearly differentiated from the SPC they offer. Too rich for my blood, but it is a curious construction.