Here's a breakdown:
* Points: A point is a unit of measurement equal to 1/72 of an inch. This is often used in the printing industry and for specifying the thickness of paper and card.
* Millimeters (mm): This is the metric unit for measuring thickness.
Relationship between points and millimeters:
* 1 point = 0.352778 mm
* 1 mm = 2.83465 points
Common thicknesses for card:
* Thin card (index card): Typically around 10-14 points (3.5 - 5 mm)
* Medium card: Typically around 16-24 points (5.6 - 8.5 mm)
* Thick card (mounting board): Typically around 28-40 points (10 - 14 mm)
Note: The specific thickness of card can vary depending on the manufacturer and type of card.