Scientific Anglers Sonar Titan Sink 3/Sink 5/Sink 7 Fly LineThis is a revolutionary concept in sinking fly lines that connects the angler to the fly in a straight line at any depth. Sonar Triple Density lines begin with a small diameter section of sinking running line which graduates in density (but not diameter) until it connects with the very fast sinking belly and tip sections. The design of the taper insures a smooth transfer of energy, eliminates hinging, and ends with a powerful head that turns over the