Scientific Anglers Sonar Uniform SinkThe idea behind the graduated densities of the SONAR Uniform Sink sinking fly line is a brilliant one: instead of a single density that can sink at an uneven rate due to the fly, the front of the Uniform Sink lines sinksfaster than the rear, all but guaranteeing a straight line connection to the fly. In stillwater and lake fishing situations, this is a must have, non negotiable, fish catching attribute. Front of fly line sinks slightly faster than