Scientific Anglers Mastery Double Taper Fly Line

The Mastery Double Taper Fly Line is tailored for those who demand precision and subtlety in every cast. Built on a braided multifilament core, this line is designed to deliver delicate presentations in tight quarters or smaller streams, where finesse matters more than brute force.

With its true double taper profile, you gain excellent roll cast control and smooth mending capabilities. It’s especially ideal when fishing dries or smaller nymphs, and when the stakes are high and the fish wary.

Advanced coatings and identification features — including SA Line ID and AST (Advanced Shooting Technology) — ensure the line shoots clean through guides, maintains slick performance, and lasts longer in the field.

What we love about double taper fly lines is that you can simply switch the fly line around when the end gets worn. Thus, the line lasts a lot longer than standard weight forward fly lines.

Key Features

Double-Taper profile: optimized for subtle and short-to-medium presentations.
Braided core for direct feel and reliable performance.
SA Line ID system: instant line weight identification to avoid mismatch.
AST coating: speeds line through guides and resists contamination for prolonged smoothness.

Spec / Grain Weight Table

Line Weight	Belly/Head Length	Total Length	Grain Weight*
DT-2-F	81.5′ / 24.8 m	90′ / 27.4 m	80 gr / 5.2 g
DT-3-F	80.0′ / 24.4 m	90′ / 27.4 m	100 gr / 6.5 g
DT-4-F	78.5′ / 24.0 m	90′ / 27.4 m	120 gr / 7.8 g
DT-5-F	77.0′ / 23.5 m	90′ / 27.4 m	140 gr / 9.1 g
DT-6-F	75.5′ / 23.0 m	90′ / 27.4 m	160 gr / 10.4 g

* Grain weight is for the first 30′ of head length as published.

Performance & Use Cases

The Mastery Double Taper is built for finesse. When you’re fishing smaller streams, spring creeks, or casting dries where the slightest disturbance can spook fish, this line excels. Its double taper gives you unmatched roll-cast control, easy mending, and the option to reverse the line — extending its usable life.

Because it’s true to weight and optimized for delicate flies and presentations, it offers elite performance when standard weight-forward lines feel too clumsy. Whether tying on a #18 midge emerger or a small parachute, this line gives you the subtle edge.

For the angler who values presentation over power — or who fishes pressured waters where finesse wins — the Mastery Double Taper is a top-tier choice.