The Scientific Anglers Mastery Trout GP Fly Line is the trusty all-rounder that trout anglers have relied on for generations. GP stands for general purpose, and this line earns that title by handling dry flies, nymphs, and light streamers with equal ease. The time-tested taper design loads fast action rods efficiently and provides enough finesse for moderate and slower actions, making it one of the most adaptable trout lines in the Scientific Anglers lineup. Whether you are a beginner building skills or an experienced angler looking for a no-fuss workhorse line, the Mastery Trout GP delivers.

Features

• Quarter-heavy trout fly line built for versatile everyday fishing across a wide range of techniques
• Classic taper design loads efficiently on fast, medium, and slower action rods for broad rod compatibility
• Handles dry flies, nymphs, and light streamers with reliable turnover and accurate loop formation
• Mastery-grade coating delivers smooth shooting and consistent performance across seasons
• Suitable for anglers at all experience levels seeking a dependable, versatile trout line
• Optimized for freshwater trout fishing in temperatures above 50F

Specs

• Best Use: Freshwater Trout Fishing
• Total Length: 90ft
• Head Length: [WF-3-F, WF-4-F] 49.5ft; [WF-5-F] 50.5ft; [WF-6-F] 51ft; [WF-7-F] 52ft; [WF-8-F] 53ft
• Head Weight: [WF-3-F] 160g; [WF-4-F] 185g; [WF-5-F] 220g; [WF-6-F] 255g; [WF-7-F] 300g; [WF-8-F] 345g
• Grain Weight: [WF-3-F] 105g; [WF-4-F] 125g; [WF-5-F] 145g; [WF-6-F] 170g; [WF-7-F] 195g; [WF-8-F] 220g