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They use PVC, I'm pretty sure all of those fancy, sparkly, overpriced cables are made of either that or TPE. It's sub standard for the engine compartment, according to SAE (J1127/J1128), but lots of people use it with no problem. I couldn't find pretty, retail wire made from Cross-linked polyethylene, so... eh...
PVC and XLP refer to the plastic coating on the wire, and the concern is the heat resistance/capacity.
Good luck.
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