UNI-Yarn (fluorescent) is the same material as UNI-Yarn but with the extra brilliance of fluorescent treatment. While useful in many applications, it is ideal for the fluorescent butts called for on many Atlantic salmon fly patterns. The Fluo-Yarn is available in six popular colors and may also be purchased in a combination package 20 spools of mixed colors (Chartreuse, Chinese Red, Green Highlander, Light Pink, Orange,Yellow).