●Riverruns wonderful popular 6 color/ set fluo thread are made from Super quality single strand multi-filament poly floss, it designed for creating limitless fluo fly effects, such as fluorescent-colored fly bodies, tops and heads, hot spots and for ribbing. ●This is a 170-denier thread and comes with 50yds of thread per spool. ●Choose from a wide range of holo-effect colors. If you buy one set, you will get 6 colors, available colors are fluo pink, fluo orange, fluo green, fluo yellow, fluo light orange and fluo red.