Rene Harrop has spared no cost or effort in securing the very finest tying materials in the world. The quality of this CDC is unsurpassed by anything on the market today. You just have tie with these feathers to believe it. The Pale Yellow is our favorite for PMD and Sulphur patterns. Also great for Yellow Sally patterns as well. The regular sized bags (.5g) will get you through a half season of tying.