The Scientific Anglers Frequency Magnum summed up in six words: big flies, big fish, small price. Designed with an aggressive weight-forward head, the Magnum fly line is built for tossing large flies, turning over split shot, and blasting through the wind. In other words, this line is a bit of a bully—which is great if you're targeting bass, big trout, and light saltwater game. It's nice to have some muscle on your side.