Approximate size is about 6 inches high by 5 inches wide. These are a full 1 liter in size so it will surely quench any size thirst.? You can see the inside of the mug was charred just like the oak aging barrels used to age whiskey.? This gives them the authentic look.? However the all natural bees wax coating on the inside covers it and also helps to seal it and keep it from leaking. Don’t worry the coating won’t affect the taste of your beer.? Although you probably wouldn’t have a problem washing the mug in the dishwasher we recommend washing it by hand in lukewarm soapy water, rinse and dry with a hand towel immediately.? This will help to preserve the appearance and make sure it lasts for years to come.