Monogram Letter "R" Absorbent Sandstone Coaster 4-Pack. Single Image, each Coaster has the same artistic design. Coaster measures 4” diameter. Manufactured in the USA of absorbent stone to absorb excess condensation from beverages. Cork backing protects your surfaces from scratches and stains. Size allows a larger glass or cup to be placed on them. Beautiful artistic design allows the Coasters 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.