Marble Coasters Set and Caddy These Marble Coasters, available in a set of four with or without a caddy, are an elegant way to personalize any gift. Perfect for engraving company logos or family names, the jet black marble engraves a frosty white color which has excellent contrast and wonderful detail. Coasters: 4 x 3/8 inches Engravable area: 2-3/4 inches