NCAA Purdue Boilermakers Absorbent Coaster - Pack Of 4 Durable cork backing protects furniture from scratching Support your favorite team with these natural stoneware Absorbent Coaster NatureStone Coasters are printed with vibrant permanent colors that continually absorb moisture. Four 4" absorbent stoneware coasters makes the perfect gift Support your favorite team with these natural stoneware Absorbent Coasters