Thirstystone 4 Pack Absorbent Stone Coasters with Protective Cork Backing 4” Square. Coasters arrive in solid wood holder, shrink wrapped. 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 rustic yet classic appearance. Beautiful artistic designs allow the Coaster to remain displayed even when not in use. This 4 pack Coaster Set makes a wonderful gift for family and friends at any time of the year.