Coastal Gnomes 4 Pack Multicolor Absorbent Stone Tumbled Tile Coasters with Protective Cork Backing 4” Square. Manufactured in the USA of absorbent stone to absorb excess condensation from beverages. Cork backing protects your surfaces from scratches and stains. Each Coaster measures 4” square. Features a Tumbled Tile edge to give it a classic yet rustic appearance. Beautiful artistic designs allow the Coaster to remain displayed even when not in use.