These high quality wooden coasters all feature a clear, vibrant, eye-catching design, perfect for any Minnesotan! They measure 4.5" x 4.5" and are 1/4" thick. While they ARE waterproof, they are not recommended for the dishwasher. The coasters have a cork backing, to prevent any scratching of furniture. We design and print these at our facility in Edina, MN.