Are my strings carbon?

I have a guitar that came into my possession with black strings that have nuts on the ends (like on a steel string guitar) on the wound strings and a similar set up on the treble strings only Sarkari Result  smaller and made of plastic so as they don’t need tying at the bridge. I’ve never Pnr Status seen the likes before and have assumed they must be carbon. They are very bright and have an excellent sustain and have outlasted 2 sets on my regular guitar, although I play my regular guitar a lot more often. Showbox
From RyanTyler

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they are not carbon, but rather a special polymer called polyvinylidine fluoride (PVFD) also known as fluorocarbon. String manufacturers commonly refer to them as “carbon” though interestingly enough, carbon trebles are really nothing more than glorified fishing line. shareit get-vidmateapk.com