Scientific Anglers Sonar Grand Slam Clear Tip Fly Line8 Foot clear intermediate sink tip for ultra wary fish. Short, powerful front taper for turning over heavy flies on long leaders, even in a saltwater wind. Belly is over weighted nearly a full fly line to load your rod immediately for those quick, short presentations when visibility is sparse. A longer rear taper helps transfer the energy smoothly into the belly of the line. Color change to show optimum loading point. For demanding tropical conditions.