Jetty Home Stone Coasters with Wine Glass Gift Set & Cork Bottom, Set of 4, Slate These 4x4 inch square coasters are crafted from natural slate, with no chemical sealers used A cork bottom protects you furniture from coaster stone Use as your own mini chalkboard; write your name to keep track of your glass or create your own design Rustic design and gift box make it an excellent gift for a bridal shower, wedding or housewarming Please note that due to the nature of slate, coaster thickness and texture can slightly vary