Marjan Fratnik's famous CDC-pattern
CLICK & BUY The Materials Used In The Video:
CDC Biot Dun Fly Tying Video Instructions - Rene Harrop.
CDC wings are good looking and makes a dry fly a great floater. Here's a few tips on getting them perfect.
First things first - I really enjoyed this book.
A history of CDC in fly tying, as well as a wealth of patterns and techniques.