Since its appearance in the 1980s, Cul de Canard (CDC) has spawned a whole new generation of fly patterns. Cul de Canards Feathers have unique light- and air-trapping qualities that send trout into a feeding frenzy. CDC is most commonly found on sedge, midge, and emerger patterns. Each package contains approximately 50 feathers. Cancer and Reproductive Harm- www.P65Warnings.ca.gov.