It is natural edge in it's purest form. As far as I can tell, this piece was formed when two limbs on the tree tried to occupy the same space and one grew around the other one. It was just to unusual for me to not try to do something with it. The wood is black cherry and it's 10 inches long by 5 1/2 inches wide by 3 1/2 inches tall. If you like the unique and unusual this just might appeal to you.