Scientific Anglers Amplitude Smooth MPX Fly LineSA Amplitude Smooth lines are simply the finest smooth fly lines in the world. Built a half size heavy, the MPX taper starts where the GPX left off. Redesigned with more mass toward the front of the head, the MPX provides the same benefits of the GPX, with an added emphasis on presentation. The power is still there, only with an added bit of finesse. Meet your new best friend. Features the revolutionary AST PLUS slickness additive for superior