I tied up a bunch of these guys tonight in size 8. I dont know what it is but the smallies love the yellow and black guy. I have often wondered if it is due to the color combo matching a bee but I am not sure. Whatever it is, they love it and I will keep making it. I call the other guy my Tiger popper based upon the color combo and not because it has stripes. It also produces. I LOVE TOP WATER FLY FISHING! I cant wait for Summer time!