One Coaster Per Listing. Made with a high-gloss, polyester-coated hardboard top, and features a genuine cork bottom to prevent sliding..: Material: Genuine cork bottom finished with a glossy white top made of polyester-coated hardboard.: Size: 3.75″ x 3.75″ (Square) and 4″ x 4″ (Round).: High-gloss top.: NB! One coaster per listing.: Assembled in the USA from globally sourced parts