The collection is made up from the following:
CCDC Hare's Ear
CDC Hawthorn
CDC Blue Dun
CDC Greenwell's Glory
CDC Black Gnat >br/> CDC Hare's Ear Sedge Hackle
CDC Grey Duster
CDC Wickham's Fancy
CDC White Moth First of all CDC is an acronym for cul de canard. This is a type of feather, used for fly tying, which is located near the preen gland on most birds such as ducks and geese.
The structure of the feather gives it buoyancy, thousands of little barbules that extend from the numerous shafts within the feather act like a raft trapping air bubbles. Its these bubbles that keep bringing the feather back up to the surface. Because of this, it is a waste of time adding floatant to CDC flies, as this will tend to cause the fly to sink because the floatant will block the barbules and prevent them from trapping air.