These sleek coasters are made from natural Slate stone! The engraved design reveals a soft white surface making the perfect contrast against the natural slate. These Coasters come in a set of 4 and each piece has 4 rubber feet on the bottom to protect your table. These round slate coasters are a nice change from the traditional square ones we offer, but still have that great pop of soft white with the engraved image! These also have 4 padded feet on the bottom to protect your table.