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At 3.75 inches ( 9.5cm ) in diameter and 6 ( 15cm ) inches tall they would be considered to be a small size. However, if space on the worktops is limited they'd be ideal.
They are the perfect size for storing beverage foodstuffs but as they don't have labels they'd be ideal for storing many other food items in the kitchen too.
It is not recommended that they are washed in the dishwasher - a wipe with a damp cloth should be all they need.