Scientific Anglers Intermediate Sonar Sink 30 Fly Line features a 30-ft. extra-fast-sinking head with handling line. Plus, Sonar sinking technology ensures your line stays down and keeps your fly in front of the fish. Shooting Technology sets a new standard for slickness, allowing your line to shoot virtually friction-free through the guides for farther casts and increased line speed. Welded loops at both ends for quick rigging. Braided multifilament core. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Fly Line.