These coasters have been printed with the photographed designs I created with my collection of naturally-formed heart-shaped rocks from the Maine coast. The original flat-lay art for each was about 2 1/2 to 3 feet wide when I photographed them outdoors from a ladder. • Art is heat-absorbed into sandstone by CoasterStone (USA) for moisture & heat absorption • 4 1/4 inch square with cork backing and packaged in cellophane sleeves • Cork label reads: Original flat-lay photograph designed with heart rocks shaped by the surf along the coast of Maine