Abrasion resistant and engineered for optimum performance at both high and low temperatures. Blackburn® Battery/Starter Cables » Fine flexible copper rope stranding PVC jacket conforms to SAE J1127 specifications « Layer of paper separates insulation from copper. providing easy stripping with no stranding damage # Flexibility ideal for tight spaces and cold environments » Blackburn® Color-Keyed® system markings for fast and accurate identification & Marked in 1-ft.