These are high quality, 4" x 4" marble coasters with direct substrate ink jet printing. This means the image will not fade or scratch off. Each Coaster has a cork backing to protect the faying surface, and the set of four arranges to make a single map.
About Boulder - from Wikipedia
The population of the City of Boulder was 97,385 people at the 2010 U.S. Census, while the population of the Boulder, CO Metropolitan Statistical Area was 294,567. Boulder is known for its association with gold seekers and for being the home of the main campus of the University of Colorado, the state's largest university. The city frequently receives high rankings in art, health, well-being, quality of life, and education.
If you're looking for a more custom option with your own map icons and text labels, check out our Custom Map Products collection