Coaster is decoupaged with a hand torn vintage map from a vintage atlas and sealed with several layers of semi-glossy varnish. The reverse side is completed with a cork backing to protect your furniture. Each coaster measures 4" x 4". Please allow up to 2 weeks for your order to be custom made just for you. Stone color may vary slightly from set shown. This listing is for ONE set of FOUR customized coasters. Green glass not included.