A strong, stretchy, continuous filament yarn which is dyed using colorfast dyes preventing it from fading. The easiest yarn to tie, cut & trim for eggs and sculpted patterns like sculpins and woolheads flies. A strong, stretchy, continuous filament yarn which is dyed using colorfast dyes preventing it from fading. The easiest yarn to tie, cut & trim for eggs and sculpted patterns like sculpins and woolheads flies.