barrel and screws in tightly for storage, and it's just over four inches long. when you want to write, you unscrew it, turn it over, and screw it into the barrel, and you have a seven-inch pen for writing. a lovely piece! is mixing it with lemon juice, hydrogen peroxide and white vinegar. apply this mixture to your teeth and rinse. you can also simply rub your teeth with baking soda twice a week for the first month and then reduce it to twice a month. 