The White River Fly Shop Mylar Cord consists of strands woven around a cord. When a length is cut for use, the cord is removed, leaving a hollow, woven tube that you slide over an underbody and secure at either end. This is the body material used on Zonkers, Rattle Rousers, and spoon flies. Length: 2. Colors:Silver, Gold, Pearl. Cancer and Reproductive Harm- www.P65Warnings.ca.gov.