What is card stock, how is the thickness or weight determined?
A stiff or rigid paper. Card stock is a term often used for post cards, catalog covers and other items which require rigidity. Card stock is measured one of two ways: Point size and Weight.
Point Size: Designates the thickness of a sheet in thousandths of an inch, so .010 would be 10pt as well as .012 would be 12pt.
Weight: Using the standard US pound (#), weight is determined as the weight of 500, 20” X “26” sheets.