If throwing streamers is your thing, you'll love these triple-density sinking lines, Scientific Angler's Sonar Uniform Sink offers multiple densities throughout the line, allowing the angler to offer a more streamline presentation to the fish. The front taper sinks the fastest followed by the rear taper which has a little slower sink rate. The running line then has the slowest sink rate, so that this set-up gives the most even sinking available in a fly line. Shooting Technology Plus integrates slickness into line coating Sonar Sinking Technology gets your fly down and keeps it there.