Thanks sleek, and Del. Yes, multiple heat treating. The bow is one, and 5/16 inches at the fades to 9/16 inches wide at the tips. The Elm was taken from my son's land, and as far as I know it is American Elm. I was able to get 2 bows from the small tree, but short bows. The other bow is an inch shorter,and 35 lbs.at 25 inches. A lefty made for Will B grandson. Here are some pics.