Scientific Anglers Amplitude Textured Infinity Saltwater Taper Fly LineThe most advanced saltwater line in our sport. features AST Plus slickness additive for increased durability and smooth passage through the guides, while the longer head and a bit extra weight accurate helps this line perform like a shooting head, even on the windiest of days. The first series of lines to feature the revolutionary AST PLUS slickness additive, the Amplitude series will shoot farther and last longer than any other line on the market.