Scientific Anglers Amplitude Smooth Grand Slam- Tarpon. Tackle the ultimate challenge in saltwater fly fishing, The Grand Slam: catching a bonefish, permit, and tarpon all in the same day. The Amplitude Smooth Grand Slam Fly Line is designed to help make this elusive goal a reality. With a short, powerful head the Grand Slam cuts through wind and turns over crabs, shrimp, and tarpon toads with ease. Now you can't use The Amplitude Smooth series of lines are, simply put, the highest-performance smooth fly lines in the world. With up to five times less drag and eight times the durability of traditional lines, this will change the way you look at fly line performance.