This popular pattern is versatile and effective and represents a large variety of mayflies as well as Caddis and small stoneflies. The bushy body gives the appearance of legs, gills and other nymph anatomy. Per 3. Sizes: 16, 14, 12, 10. Colors: (003)Black, (411)Olive, (661)Flashback, (681)Gold Ribbed. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Flies.