Eggstacy is a revolutionary new fly-tying material for egg-flies. Unlike standard egg-yarn, which involves spinning yarn, Eggstacy is built on a core which means you can simply tie it like a chenille. Eggstacy is the first material to be made from new "Next Generation" (NX-Gen Fiber. This material is a game-changer synthetic. NX-Gen Fibers are micro thin and designed to trap water, creating a slush-like texture when wet. In white, fluorescent red, chartreuse, sunburst, fluorescent yellow, fluorescent peach, salmon, orange cheese. UK.