Solid core OFC vs stranded OCC copper

Litz wire is a particular type of multistrand wire or cable used in electronics. The wire is designed to reduce the skin effect and proximity effect losses in conductors used at frequencies up to about 1 MHz.  It consists of many thin wire strands, individually insulated and twisted or woven together, following one of several carefully prescribed patterns

I'm with @jaymark .

Solid core OCC in Teflon. 

@jasonbourne52

Yeah, there is. I’ve compared many types over the years and solid core is cleaner, less confused when music is busy, and yields blacker internote spaces..

IMO there is NO sonic difference between stranded and solid core.