It shoots with quick precision and it sinks just as fast Scientific Anglers Sonar Sink 30 Warm Fly Line gets your streamers and big flies down to where the fish are. Created for warm waters and decked out with Sonar Sinking Technology, the 30-ft. extra-fast sinking head descends quickly and evenly. Shooting Technology Plus delivers remarkable precision and casting control. Braided multifilament core ensures long-lasting durability. Scientific Anglers Line Identification label makes it easy to identify similar-colored lines. Welded loops. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Fly Line.