Who the heck knows? If we had a composite class, it would go there without a doubt.
If it was horn backed wood. I am still not sure. We have clumped sinew backed bows with self bows because of they aren't backed with wood or boo. Since the back of the bow is the same piece as the working core, I would lean toward self bow. Call the filler, artistic. I sure would have liked to see it without the filler. Justin