Here are my thoughts: Technically, I agree with Jawge on the definition, but understand and agree with the definition used for the purpose of the BOM competition. It doesn't make much difference what you call them to me, I make the bow the wood tells me to make, and without regard to rather or not it need/has sinew, rawhide, or snakeskin, backing and still call it a selfbow. As a side note regarding backing with a snakeskin, I use python skins (when I can get them) in place or rawhide because it is thicker then my antelope rawhide and looks better. I donate or give most of my bows away and have started backing most of them with python, antelope rawhide covered with a snakeskin, or sinew covered with a snakeskin, for liability reasons. I haven't had any break, but want some legal protection just in case. Just a thought, I never post my bows because I have no desire to enter a competition: Can we post them without having them automatically entered in the BOM competition?