Scientific Anglers Mastery Saltwater Fly Line -If you had to choose one saltwater fly line for a variety of situations and species, the Mastery Saltwater taper should be a finalist. The versatile compound design provides enough power to cut through the wind, while retaining a delicate delivery for spooky fish on the flats. Built for a wide range of temperatures and environments, the Mastery Saltwater simply does it all. Compound taper turns over big fliesDesigned for use in temperate and tropical climatesTwo tone for better visibilityVariable head lengths for distance casting and quick shots to passing fishSmall diameter to deal with windy conditionsCompound taper turns over big fliesTropi-Core technology for tropical climates