Natural Shellstone Coasters are mined in the mountains of Turkey, then imported and manufactured in the USA. Shellstone is a type of limestone that is similar to Marble, but more dense. Coasters absorb drips and condensation from beverages and come with a cork backing that protects surfaces. Artistic designs are printed on the surface of each coaster. These attractive coasters add elegance and distinction to your space. Because this is natural stone, the coasters may vary in shape and color. Coasters are made for long lasting use.