EZYHOME Drink Coasters Set of 6 Ceramic Coaster Beautiful Absorbent Coaster Drink Mat with Cork Base Flower Patterns Round Coaster Non Slip for Coffee,Beer,Mug,Glass Bottle,Home and Bar.3x 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