Human Anatomy - Set of 4 Coasters 1/4 inch thick Very High Quality Human Anatomy Prints, Vintage Skeleton Illustration Human Anatomy - Set of 4 Coasters 1/4 inch thick Very High Quality Human Anatomy Prints, Vintage Skeleton Illustration Set of 4 Coasters Each Coaster is 4 x 4 in diameter and 1/4 inch thick They also have a genuine black rubber (not foam or cork) base for a non-slip finish.