It's mainly plastic sleeving, and heat shrink tubing where necessary.
The same factory manufactures original Audi/VW harnesses.
When has braided sleeving been an indication of high quality?
It just lets dirt and moisture right through.
The braided sleeving i'm using is awesome and I can cut it with my handy long cut shears:
Braided from heat-treated fiberglass and
coated with high-temperature resins, this sleeving
resists abrasion, chemicals, solvents, and
oil. Temp. range is –94° to +1200° F