This twisted Mylar flash material that adds sparkle to your flies. Krystal flash can be tied in at various points of the fly as an attractant. Start with the pearl color and expand from there. Make your flies visible from long range in low light conditions by adding Fluorescent Pearl Krystal Flash. Used to add fish-attracting colors to anything from Wooly Buggers to large pike flies. Good forever Krystal flash is available in 12 colors. You gotta pick your favorite from this palate. Always works, always applicable, always will be