EZYHOME 8Pcs Drink Coasters Set, Absorbent Ceramic Coasters with Holder, Mandala Coasters with Non-Slip Cork Back, Housewarming Gift Stone Coaster, Round Rustic Coasters for Home Restaurant Office Set of 8pcs3x Stronger Water Absorption Ceramic Made from stone absorbent ceramic with natural authentic cork base. Size: 4 inches. Zero Worry For Scratch The back of coaster is cork which will help prevent the porcelain from scratching tabletops or counter tops and provides a non slip surface so you dont have to worry about them slipping off the table. 4 Inches Bigger Ceramic Coaster The moisture absorbing ability of this thicker bigger 4 inches in diameter