Udel Coasters The tiles are backed with cork to protect furniture from moisture and scratches. Each coaster takes on different appearances due to the underlying marble tile which has its unique veins, pitting and marbleizing. The beauty of the marble shines through giving it a beautiful weathered look. Each coaster is backed with a cork backing to absorb moisture and protect furniture. Other colleges and towns available. If we don't have it, we will design them for you! CARE: Wipe with a damp soft cloth. Not dishwasher or oven safe.