One Millimeter is one tenth of a Centimeter.
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85.60 × 53.98 mm (3.370 × 2.125 in) and rounded corners with a radius of 2.88-3.48 mm
98.425% of 1 inch (rounded).
Approximately 1 mm is about the size of a grain of sand or the thickness of a credit card.
Well 1 inch is 25.4 mm, so it's roughly 1 inch by 1 inch.
3/4 x 1 1/2"