Our Luca Mariano Distillery round coaster is made of ceramic with a protective cork backing comes in a set of 2. The absorbent stoneware makes it ideal for everyday use. The round coaster measures 4 inches in diameter, this is a perfect size for drinking glasses, coffee cups, white wine glasses, tea cups, or any other average sized glass. Care instructions: - Clean or rinse and allow the back of the cork to air dry. - Make sure the coasters are clean and dry before stocking them.