When reliability and performance can’t be compromised you want this wire – not the inexpensive primary wire you find in most parts stores, this the wire we use on our own harnesses. Stranded real copper core. Cross-linked polyethylene insulation for superior abrasion resistance. Withstands over 1250C (2750F). Exceeds OEM specifications for under hood applications.Thinner polyethylene covering means lighter weight and much easier routing.