A strong, stretchy, continuous filament yarn which is dyed using colorfast dyes preventing it from fading, and a special fluorescing dye is used on the Fluorescent colors. The easiest yarn to tie, cut, and trim for eggs and sculpted patterns like sculpins and woolheads flies. For tying the Ultimate egg pattern. The Clown package has all the colors needed for the Clown egg. Also good as an assortment pack for someone who wants a variety of colors. 4 colors.