Scientific Anglers Stillwater Seamless Density Fly LineThe SONAR Stillwater Seamless Density lines are a unique departure from the traditional graduated density lines of years past. With a variety of double density sinking rates and a smooth, seamless transition between each, the SONAR Stillwater Seamless Density lines provide straightline connections to subsurface flies, meaning youre in control of the fly every second its in the water. Designed specifically for the demands of stillwater anglers Based on