This is by far the heftiest mug you will ever sip coffee from. In fact, they weigh a substantial 17 oz empty! This high-quality porcelain mug by Espresso Parts can hold 8-10 oz of your favorite MoonBeans coffee. They are microwave and dishwasher safe. The finish on these diner mugs is magnificent and will last in the rough and tumble environments found in diners, cafes and espresso bars. Therefore, it will still be jaw dropping after years and hundreds of cups of coffee later!