These coasters are an exclusive product to North Woods Trading Post. The coasters are hand made in Maine and the image is imprinted on sandstone with a cork bottom. The image is a topographical map of the massive of Katahdin and is the Northern Terminus of the Appalachian Trail. We also offer the peak sign of Katahdin marking the Northern Terminus of th Appalachian trail. These may be ordered in tumbled marble as well.