A map of the beautiful Greek Island of Crete. Our coasters are made with a dye-sublimation process. The inks are infused directly into specially coated ceramic tiles, using high temperature and pressure, resulting in vibrant colors. The Hi gloss finish is waterproof, heatproof, and has a cork base. Our coasters, however, are not intended for use as trivets for hot pots or cookware. Each coaster measures 4.25" x 4.25".