Scientific Anglers Amplitude Smooth Trout ExpertTrue to Weight Line 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. Features the revolutionary AST Plus slickness additive for superior shooting ability and increased durability Excels in medium to long distances with dry flies and smaller nymphs;