Senyo's Wacko Hackle is a great combination of form and function. Its WACKO! Tie in a section on the top and bottom of the hook, comb it out and youre done. Apply it using a dubbing loop and you'll get an unbelievable hackle imitating effect. It is a multistrand flash material that flows and tapers nicely on any Intruder or wet style fly pattern.