branch from a box elder cut down a couple years ago. It was in my fireplace woodpile (before I got a lathe) and headed for the fireplace last night. Branch was about 3 ft long and about 3 inches across and pretty gnarly looking. I decided to check it out before burning it. One cut with the bandsaw and I knew it wasn't going into the fireplace. Got about 20 blanks to make pens like this.