Inexpensive paint brushes in that gray-green-brown hue. Usually a bit ragged on the ends but a good supply of cheap fibers to form wingcases or ribbing material. Durable, pliant and takes a permanent marker.
flies, fly pattern, fly pattern design, fly tying materials, flyfishing, how to tie flies
Fly Tying: Wingcase Material (Paint Brush Bristles)
SwittersB & Exploring 