Black GXL Cross-Link Wire, 14 Ga (100 ft.) Type GXL; medium thickness wall special purpose automotive wire is insulated with chemically cross-linked polyethylene. Withstands prolonged temperatures of up to 125C (257F) without melting or fusing. Insulation has a smooth surface and is available in bright colors. Operates optimally between the extreme temperatures of -40C to 125C (-40F to 257F).