the uniform vertical lines that encircle each cup. The drink ware set's white exterior can be paired with most dinnerware or can be enjoyed on their own. The Porcelain construction is dishwasher safe for fast cleaning and microwave safe for efficient reheating. The 12 piece set is perfect for families, dinner parties, or other get togethers. Serve delicious hot chocolate, fresh coffee, soothing teas or more!