On hand, I have a section that's approximately 6 feet (2 meters) and another that's 9 feet (about 3 meters). I can easily curl the cable to about a 3 inch (8cm) diameter circle, and not feel like I'm forcing it. If you hold the wire, it'll loop down to about a one inch (2.4 cm) circle (on the inside diameter). Nice stuff! So, as I said, it has two sets of wires, three conductors at (I THINK... not 100% sure) around 26 ga, and 6 conductors at I think 30 ga. There are two electrically isolated braided jackets, with teflon insulation tape wrapped inside the braid. The outer braid wraps the 6 smaller wires (and has 6 teflon filler strands to keep the wires separated evenly). It's durable too, the wire strands are SUPER fine, which is how it's so flexible. When you strip the wire, the strands tend to "puff out" a bit, cause they are simply too thin to keep any rigidity. That's a good thing! :P
The jacket insulation is very stretchy... The cables I assemble have the jacket pulled back, the cable assembled, then the jacket fed through a compressing strain relief, and butted to the connector's internal housing. It results in a cable that's water, air and even steam resistant. They have to be, cause as a part for a surgical tool, it'll be repeatedly autoclaved, which is basically cooking it in a pressure cooker. >100°C at >atmospheric pressure. The ones we use at the lab where I work are 122-124°C @ 17 PSIg.
The original application for these cables would have been to operate a brushless electric motor in a surgical tool. The three larger gauge wires were to carry power to the motor's windings, and the 6 smaller wires carry power to and signals from the magnetic hall effect sensors that provide the commutation signals from the motor to the drive circuit.
I have more out at my storage unit, but I'd have to dig it up. I presume you're the same bendrexl at GeekHack? I'll send you a PM.
And yeah, this cable IS pretty sweet! :D