Geode Crackle coasters are made by a skilled group of artisans at our studio in Minneapolis, Minnesota. These square ceramic coasters are handmade, one of a kind, and variation should be expected. Orders of 4 of the same color will be sent in arrangements that compliment each other as sets. Each coaster is one of a kind and unique, but we will happily group similar coaster Each coaster measures approximately 4" x 4" and has felt feet attached to the underside to protect tabletop surfaces.