The basis weight of a given grade of paper is defined as the weight (in pounds) of 500 standard-sized sheets of that paper. With that in mind, here are different examples of paper grades and their respective basis weights:
Bond: Most commonly used for letterhead, business forms and copying. Weights usually range from 20# for copying and 24# for stationery.
Text: The most common weight for printing. A high-quality grade paper with a lot of surface texture. Can be coated or uncoated. Weights are typically 60#, 70#, 80# or 100#.
Cover: Used in creating business cards, postcards and booklet covers. Can be either coated or uncoated. Weights are 65#, 80# or 100#.