4x Seashell Mosaic Pearl Tiles Pattern Print Kitchen, Dining & Bar Drink Ceramic Coasters - Set of 4 High Quality Seashell Mosaic Pattern Print on Ceramic Tile Coasters Set. Best for Coffee, Bar & Drinks Coaster Non-slip Cork Backing Set of 4 pcs Material: Ceramic (Glossy) / Cork (Back) Dimension: 4.25