a flea or a crumb could be a millimeter. A US dime is 1.35 mm thick, and a penny is 1.55 mm thick. See related link
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A pinhead.
flys are a millimeter long
The thickness of a plastic ID card or credit card is approximately one millimeter, It is also the approximate thickness of a stack of 10 pieces of paper. One millimeter is approximately a sixteenth of an inch.
a millimeter is the length of a millimeter
a millimeter