Designed to imitate natural Peacock Herl Semperfli Synthetic Herl 1mm Extra Small is a fritz / chenille which contains all the iridescents that you find in natural Peacock Herl, accents of blue, green, copper and gold highlight and change in different lighting conditions just like natural Peacock Herl. Peacock herl has been used for many years as a stunning fly tying material. With its stunning iridescence fly tyers love the way the colors change as you look at this amazing material.