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Scientific Anglers
Mastery Series MPX Taper Fly Line

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Why We Like Scientific Anglers Mastery Series MPX Taper Fly Line

The new standard for Scientific Angler fly lines, the Mastery Series MPX Taper Fly Line is the improved version of the classic GPX Taper. Redesigned with more mass toward the front of the head, the MPX mixes power with an added emphasis on presentation, so we can drop a dry fly right in the feeding lane of a brown trout, huck wooly buggers around the river, and turn over heavy nymph rigs. Designed with versatility as a priority, this well-rounded line is excellent with dry flies, nymphs, and streamers, so we can stay flexible on the water and catch more fish.


  • Improved version of the old GPX Taper fly line
  • Best for moderate and cold climates
  • Braided multifilament core is supple, thin, and strong
  • Welded loops for easy leader connections
  • AST slickness additive reduces friction and increases distance
  • Built a half-size heavy
  • Item #SAS001G
[core] braided multifilament
Overall Length
90 ft
Fly Line Weight
[WF3] 110 grains, [WF4] 130 grains, [WF5] 150 grains, [WF6] 173 grains, [WF7] 198 grains, [WF8] 224 grains
Fly Line Style
Fly Line Type
weight forward
Welded Loops
Taper Design
Running Line
Recommended Use
fly fishing

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