Hello buddy, it's just braided sleeving that goes over normal cables. Got it off ebay for £2.99 posted for 5 metres! The 6mm diametre is what you want for 10th wires and then you just put a bit of heat shrink either end to hold it tight in place

Hi, already asked you in thread what kind of wiring you are using.
Looks awesome, the black wires, what type is it exactly?

greetings from munich
steve