Celebrate your favorite 40 year old with these custom birthday jars with a classic cookie jar shape. Each has a 6 oz capacity and measures 3 1/2" tall with a 2 1/4" opening. It has a rubber gasket for an airtight seal and is an ideal container for wrapped candy. If you decide to fill it with unwrapped candy, we recommend you wash it. Jars are top rack dishwasher safe and the imprint stays on well, as it is screen-printed directly on the glass.