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Acoustic Guitar Size and Shape 

There are many different acoustic guitar sizes and shapes. A number of them were started by C.F. Martin and Co in the late 1800's and early 1900's and have since been adopted as standard sizes by subsequent guitar manufacturers. Martin began using a series of  0's (pronounced Oh's,  not zeros). The 0 is smaller than the 00 and the physical size gets larger with each additional 0.  The Dreadnaught or "D" size is larger than all of the various 0 models. Later, Gibson introduced a Jumbo guitar which is among the largest popular acoustic guitar.

The chart below shows the basic shape and size of most popular acoustic guitar sizes.