This is really long pair of what I believe Russ Andrews called the GQ cables. They're seemingly made from the Kimber Cable GQ-TCSS, a design which is a four way plat that uses 19awg copper wires with PE/PTFE insulation.
It's very thin and flexible cable which in addition to its long length makes it a very useful tool for those of us that like get fed up with interconnects being too short when we're testing out equipment and experimenting.
