Relatively unheard of in the UK. Luminous produce a very well regarded passive pre, that I wish I hadn't sold, and various cables.
I bought these when I ran monoblocks next to my speakers, 5m was required and these fit the bill. So if you need long interconnects these may be worth a go.
Specification
21-gauge, silver-plated solid-core, 99.997% (4/9s) OFC copper, with mil-spec Teflon™ insulation.
Terminations are Cardos silver plated RCA connectors (although one is gold, go figure)
No real idea of their value, how about £100 inc UK P&P