These are matched Mallard wings, these include the blue back quills often used in McGinty and the Bloody Butcher. Wings are matched and the front of the wings is used for the Wisconsin favorite, the Duck Shoulder dun. These can also be used on the Leading Coachman and old Bergman wet fly patterns. Quills can be removed with pliers or cut off close to the bone. We suggest using micro side cutters to cut quills.