This pattern is a great all-purpose fly. Imitates a variety of small nymphs, particularly that of the mayfly. The Pheasant Tail is among the most well-known patterns created by Frank Sawyer, the famed English river keeper, fly-tier and author. Per 3. Sizes: 20, 18, 16, 14, 12. Colors:(013)Natural, (411)Olive, (661)Flashback.