The CDC Flashback Pheasant Tail is a variation of the traditional Pheasant Tail nymph used in fly fishing. It incorporates CDC (Cul de Canard) feathers, providing enhanced buoyancy and lifelike movement. The fly typically has a pheasant tail fiber body, a flashback wing case for added visibility, and the CDC feathers near the thorax, imparting a realistic appearance to emerging insects. This pattern is effective for imitating mayfly nymphs in various water conditions.