We're big fans of this style of split CDC wing, it fishes wonderfully by itself for picky fish eating Duns or holding up small droppers in low and clear conditions. These are a great choice if you're looking for a pattern similar to a Shuttlecock.
Here's what Antonio has to say:
"This pattern was developed with the need to be one step ahead of other competitors. As you know after a couple competition sessions everyone heard or saw the patterns you used and this one has been kept close to my vest for many many years. My adult uses a CDC split wing a straight hook and also the materials squirrel body, CDL tail, the perfect imitation for an adult mayfly. It lands extremely soft on the water, floats very high, is easy to see, and fish take it like it is a natural time and time again."