https://www.youtube.com/watch?v=F0nEocphm-Mthis is about the strangest bow I've seen lately.
It defies a number of concepts of economy of weight typically applied nowadays.
The core is made of "chinese mulberry", also called Cudrania, which is in fact the same genus as osage (Maclura tricuspidata), not to be confused with Mulberry of the genus Morus.
the pre-tillered core is first wrapped in rawhide, later on another layer of hide with fur is added to it.
The siyahs are incredibly bulky too.
If I understand the video correctly, the draw weight is supposedly some 90 pounds, which I find pretty hard to believe seeing how it is drawn, and how thin the core slats look. Rather looks like 40# at most to me.
But still, an interesting bow to behold.