Berkley Vanish Transition Fluorocarbon Line is virtually invisible underwater, so fish dont see it, yet it transitions to either gold or crimson red above water for higher visibility to the angler. Simply put, the fish arent spooked and anglers can detect strikes faster. Berkleys Vanish Transition Lines maintain all the strength and abrasion resistance of fluorocarbon and are super-easy to control, with improved knot strength. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Line.