Cigars are commonly categorized by the size and shape of the cigar, which together are known as the vitola.
The size of a cigar is measured by two dimensions: its ring gauge (its diameter in sixty-fourths of an inch) and its length (in inches). For example, most non-Cuban robustos have a ring gauge of approximately 50 and a length of approximately 5 inches. Robustos which are of Cuban origin always have a ring gauge of 50 and a length of 4 ⅞ inches.