Semperfli Peacock Quill Sub was designed to be particularly special in that it has that same amazing multicolor iridescence of natural peacock which is very difficult to reproduce in a synthetic material. The extra small size in this material would be perfect for small perdigon and other nymph bodies, and the Small size which is more of a small braid would be a good body wrap or collar on a pheasant tail style fly, or for anywhere you need some extra irr