UV2 Coq De Leon Perdigon Fire Tail Feathers are fluorescent dyed Coq de Leon feathers with exceptionally long, stiff barbs which shake and shine with life. The ultimate in "Euro" style nymph and dry fly tailing, the UV2 dying process enhances the beautifully mottled feathers with UV fluorescing and reflecting properties. All this increases the visibility and giving off a color spectrum more visible to fish so you can get your catch!