4"x4"x1/4" Natural Black Slate Coaster. The bottom has no-slip protectors.

U.S. Route 66 or U.S. Highway 66 (US 66 or Route 66), also known as the Will Rogers Highway, the Main Street of America or the Mother Road, was one of the original highways in the U.S. Highway System. US 66 was established on November 11, 1926, with road signs erected the following year. The highway, which became one of the most famous roads in the United States, originally ran from Chicago, Illinois, through Missouri, Kansas, Oklahoma, Texas, New Mexico, and Arizona before terminating in Santa Monica in Los Angeles County, California, covering a total of 2,448 miles

Please note that these are natural slate coasters so the edges and surface of the coasters will vary from coaster to coaster.