Scientific Anglers Mastery Double Taper Fly LineScientific Anglers Mastery Double Taper Fly Line, Double taper fly lines may not be the most versatile of the bunch, but theyre very good at what theyre designed to do: delicate work at shorter distances. An excellent dry fly line, the Mastery Double Taper excels at presenting flies with a touch of grace, which is extra handy on spring creeks and smaller streams. Double taper lines are extra delicate for subtle presentations Excels in short to medium