These Slate Wine Coasters are beautiful and functional wine glass coasters all at the same time. These slate coasters can function as a mini chalkboard that can be effortlessly customized with a simple stroke of chalk (not included) to add a guest's name or fun comment and easily cleaned with a damp soapy sponge. Each slate wine coaster has a natural edge and a full felt backing so it will not scratch your tabletop. These coasters are 4" square, perfect for wine or other beverage glasses. Water rings will not stain the slate coasters. The set of four slate coasters make a great wedding gift, hostess gift or new home present! The ideas are endless!