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The weight of a specified area of paper or paperboard is defined as the "basis weight". There are a number of areas that are specified for the basis weight. Examples include 1,000 square feet (MSF); 3,000 square feet (3MSF), which is also the area of a ream (500 sheets) of paper or paperboard of size 24 inches by 36 inches (2 feet x 3 feet). The metric measure of weight, "Grammage", is expressed as grams per square meter (gms).When the basis weight of a combined board product is reported, the weight is that of the entire product, all components included.