Cul de canard (CDC) (French for "duck bottom") are the feathers from the back of a duck directly around the preen gland (uropygial gland); they are very buoyant due to preen oil produced by the preen gland. They are used when tying dry flies for fly fishing. CDC Mayfly, a very realistic tying, imitating the natural insect.The detached body being deerhair gives good floatability coupled woth the CDC post makes it very visable.The barbed competition-style hook pierces quickly and holds securely due to its ultra-sharp design
