Black SXL Cross-Link Wire, 16 Ga (100 ft.) Type SXL; thick wall special purpose automotive wire is insulated with chemically cross-linked polyethylene. Withstands prolonged temperatures of up to 257F without melting or fusing. Insulation has a smooth surface finish and is available in bright colors. Operates optimally between the extreme temperatures of -49F to 257F and -45C to 125C at 12 volts.