Scott - it's Tech Flex - same stuff I was using before with the other amps.
It's actual fire retardant loom, as indicated by that white tracer in the loom.
http://www.techflex.com/splashpage.asp
All power and ground is loomed wit it.
Signal cables and speaker cables are loomed with the regular PET stuff, at least up until the point where it passes through the amp rack where we made the switch to the fire retardant for the better look.
I'll be sure to have more up sometime this weekend after it's been tuned and we've had a chance to listen to it.
Thanks all! I really appreciate it!