CounterArt Anchor 4 Pack Natural Travertine Absorbent Stone Coasters are mined in the mountains of Turkey, then imported and manufactured in the USA. Each coaster is made of terrestrial limestone. Travertine absorbs drips and condensation from beverages. Coasters have a cork backing which protects surfaces from scratches and water stains. Artistic designs are printed on the surface of each coaster. These attractive coasters add elegance and distinction to your space. Because this is natural travertine stone, the coasters may vary in shape and color. Coasters are made for long lasting use.