Peacock herl is one of the most versatile fly tying materials. It's iridescence makes it a must material for every type of dry flie, nymph and streamer. Used for wings, bodies, tails, and thorax. Peacock herl is used in many classic Steelhead and Salmon flies as well as Trout, panfish and Bass flies . Use these eyes if you want the fullest herl possible.