My dad did some cleaning-up around the yard, this past summer. This included the removal of an old, dead tree on the edge of the property line. I stopped for a short visit, and I found a lovely piece of wood, which would have gone into the bonfire pit had I not saved it. As close as I can tell, it's a piece of Northern Ash, about 15 years old. It has been cut into 1/4-inch discs, sanded, and sealed with polyurethane. I also added some little felt pads on the underside, to prevent scratching. We now have a beautiful set of table coasters.