When you're casting a streamer to a big swimmer who doesn't like to come to the surface use the Scientific Anglers Sonar Titan Sink 3/Sink 5/Sink 7. This line has Sonar sinking technology to ensure your streamer drops consistently and stays low as you tempt that sucker into biting. When you do get a hit the triple density construction makes the line respond quickly to your motions. The short head gives the line the power to load the rod and smoothly turn over larger flies like streamers so you can get a nice presentation and powerful distance on your cast.