In printing, caliper refers to the thickness of a sheet of paper, measured in thousandths of an inch or micrometres.
The caliper of paper can have a significant effect on the feel, weight, and appearance of a printed item.
It can also influence the suitability of the paper for certain types of printing or for certain products.
The caliper, or thickness of a paper, does not necessarily translate directly to its weight, or GSM (grams per square metre).
Some papers can feel thick but weigh less than others as there is more air between the paper fibres, and so it is less dense.
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