Durable, hard and glossy surface with cork back.
Coasters come in sets of 4 (only two are shown in this photo) and measure 3.75 x 3.75 inches. They're slightly more than 1/8th inch thick.
Your photo must be at least 768 x 768 pixels in size.
Coasters have good color reproduction, but not as accurate as photographic prints.
(Gorgeous photo courtesy of Moon River Photography)