Fluoro Fibre micro flouroscent synthetic fiber lights up in the water. A great material to add highlights to saltwater fly tying materials. We also like it for tails and tags on both saltwater streamers and salmon and steelhead flies. Ideal for gills it becomes even more visible when laid over a variety of Fishient Group tying materils like Steve Farrar SF Blend and Deadly Dazzle. Compare at $4.40 at Caddis Fly Shop!