Roo's Hybrid is a variation of the original Montana Hybrid. With a stronger hackle, adding durability and a longer life which equals more big carp, bass, and trout. Imitating crayfish, mudbugs, big nymphs like damsel, dragonfly, hellgrammites and many more. A great way to use Roo's Hybrid is a start off with a slow retrieve with some up and down. Then gradually speed it up over time. If you are going after big fish like carp and bass 15 lb to 40 pound test fishing line is a excellent choice. But if you're going after trout depending on size and weather 4X all the way to 6X are great choices.