Pen made for my uncle using a spoke from an old buggy wheel of my grandpas. Long before I was born he replaced the spokes on a wheel and my uncle has had them on a shelf in an old barn, luckily when he tore the barn down he gave them to me instead of throwing them away. I have no idea what the wood is, and the dark lines you see are actually cracks that had been filled with paint over the years (blue then red, then yellow from what I can tell.)