Scientific Anglers Nylon Freshwater Leader - 9ft - It’s all well and good to have a quality fly line, but without a good leader, you’re out of luck. Scientific Anglers nylon Freshwater leaders come in two different lengths and feature a longer, larger butt section for easy turnover. These materials feature the high wet knot strength and true-to-spec X sizes. Fishing Type: Dries, Indicators, Nymphs, Streamers, Big Dries, General, Poppers, Stillwater Length: 9ft Material: Nylon Water Type: Freshwater Species: Trout