That's not carbon fiber although I have used it before, it's just the threaded music wire that comes in the kit with ball links on the end. Disregard the crack about the diaphragm vent tube, I put that up there as a funny, the picture is of a carb off an engine that was sent to me for service, not the best example, it was replaced. Do a search in the DL-50 thread, there are lots of good examples and discussionin there.</p>