This is what that wire is. It is pure copper wire
it’s the type of wire that the manufacturers use for wiring appliances and so forth
Appliance Wiring Material (AWM) consists of stranded, soft annealed copper conductors insulated with Polyvinylchloride (PVC). Constructions may be solid or stranded and are available in 1000 V (1kV) ratings. Canadian Standards Association (CSA) listed AWM-IA (Class I Group A) and TEW products are 600 V FT-1 rated.