Primary automotive wire-single conductor
Primary wire is PVC insulated with copper strands.  It is highgly flexible and resists oil, aging, flame, and chemicals.  It is available from 20 AWG to 8 AWG in a variety of colors and spool sizes.

Available in 14 colors:

20, 18, 16, 14, and 12 AWG:  Red, White, Black, Green (light and dark), Yellow, Brown, Blue (light and dark), Gray, Orange, Purple, Pink, Tan

10 AWG:  Red, White, Black, Green, Yellow, Brown, Blue, Orange

8 AWG:  Red, White, Black, Green