Type GXL Automotive Wiring Construction 19 STRANDS OF 27 AWG BARE COPPER WIRE. Conductor: Bare Copper Insulation: Cross-Linked Polyethylene (XLPE) Type GXL Automotive Wire Ratings and Approvals: Recommended Temperature Range: -51°C to +125°C SAE Specification: SAE J-1128 OD: .116 100 FT EACH OF THE 10 SOLID COLORS: BLACK, WHITE, RED, GREEN, YELLOW, BROWN, BLUE, ORANGE, PINK and PURPLE.