This slate coaster is laser engraved with a drawing of a hermit crab The coasters measure roughly 4 inches in diameter and are approximately 1/4 of an inch thick. They come with pads on the bottom to protect your furniture. All Bay Slate products are handmade on Cape Cod in the United States. Please note that these are natural slate coasters so the edges and surface of the coasters will vary from coaster to coaster.