White River Fly Shop Polarflash fly-tying material creates brilliant wings, tails, ribbing, and body components. Micro-nylon filaments tightly wrap each strand of Flashabou, to give you a strong fiber with pronounced light diffusion, increased sparkle, and flash. Size: 10. Colors: Green Pearl, Rainbow Pearl, Pearl, Mirage Opal, Gold, Silver, Black Rainbow, Blue Pearl. Cancer and Reproductive Harm- www.P65Warnings.ca.gov.