I'm not sure. I hope to find a pattern so I can test it on brookies. I caught two on a green leach with red tail today, they were full of small shrimp. My brother suggested the pattern, says its hot when others are not but hasn't got any left to show. Stores closed now and cant seem to find any idea's on net.Could be a Trout Fin Bucktail, or a variation on the Mickey Finn.