The size of a cigar, in name, is a nearly meaningless designation, the reason being that the size of a cigar, when determined by a name such as corona or robusto, is not a universal standard. In other words, one company's corona is another company's churchill even though both measure the exact same length and ring gauge. Once you understand this, most of the confusion regarding cigar size disappears. All you really have to know is that cigars are categorized by length and ring gauge which is a fraction of an inch measured in 64ths.
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