Scientific Anglers Amplitude MPX Fly Line The Amplitude MPX features the revolutionary AST Plus technology. It's microtextured surface traps air to provide superior shootability and flotation while also eliminating line flash and vastly reducing friction. Lines sit higher in the water with less drag and water spray, as well as easier mending, roll casting, and pick-ups.

The MPX provides the same benefits of the GPX, but is redesigned with more mass toward the front of the head. The power is still there, now with an added bit of finesse.