The RS CDC Nightmare Black and Blue is one of the deadliest seatrout flies out there. When the light fades and darkness falls, these are the flies you need to lure those big seatrout and the classic flying treble takes care of shy takes. Tantalising Amherst pheasant spear feathers, arctic fox, cdc hackle and JC give this fly a whole new dimention and seatrout love them!