Single Image Absorbent Stone Tumbled Tile Stone Coaster Set of 4. Made 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 inch by 4 inch square. Beautiful artistic designs allow the Coaster to remain displayed even when not in use. Set of 4 arrives in a clear plastic box so image can be viewed.