Our Biltmore® coasters are made of tumbled Botticino marble quarried in Italy. The natural marble makes each coaster unique and imperfections are inherent to the design. Each coaster features a Biltmore Wine Label and is hand printed in the USA. The backs are corked to help prevent damage to your fine home furnishings. Measures 4" x 4". Use damp cloth to clean. Do not submerge in water. Intended for indoor use only.