Ostrich Herl is a great material to use on a variety of streamers and nymphs. Hareline Ostrich Herl comes in a variety of colors to provide the avid tyer with as many options as possible. Many anglers use this material to tie Scuds and other nymphs because of its slightly stiffer fibers and because of the clean, durable nature of the herl. These packages provide enough herl to tie dozens of flies and the herls are easy to cut off of the feather and tie into your fly.