14 gauge white with yellow GPT (PVC) wire
 
Copper electrical wire - copper conductor core, PVC insulation. The same wiring our company uses in many harnesses that are sold by some of the top companies you know.  Used for car or motorcycle rewiring jobs.
 
Markings - none
 
Specs:
Standard copper wire
Resistant to flame, moisture, and abrasion
Holds up against acid, solvents, gasoline, and ozone