Coaster: Claude Monet series ~1873-1906 courtesy of the National Gallery of Art, open access. 

Each square coaster is made with a high-gloss, polyester-coated hardboard top, and features a genuine cork bottom to prevent sliding. Printed with high quality images. .: Material: Genuine cork bottom finished with a glossy white top made of polyester-coated hardboard .: Size: 3.75″ x 3.75″ (Square) .: High-gloss top Coaster