Add a bit of under the sea flavor to your coffee or tea with these lovely Sea Turtle Drink Coasters. Our Sea Turtle Coasters are made of all natural sandstone and feel as beautiful as they look. Since sandstone is a natural material, each coaster has a bit of a different look to it due to the normal variations in the material. The back of the Sea Turtle Coaster Set is made of cork to protect your table surface. Our Drink Coasters come four to a set and measure 4 inches in diameter.