From Collings:

With the exception of the Baby, the 0 is our smallest guitar and is offered with the same shorter scale found on the 12-fret 00. Although measuring only 13.5 inches in width (smaller than a typical classical guitar), the Collings 0 has tone and volume that belies its first impression as being less than full-sized. It can double as a travel guitar or a small OM, performing both roles equally well. The same neck and woods options offered with larger Collings models are available on the 0 as well, giving players an almost infinite range of tonal possibilities.

This example features an Adirondack spruce top over Figured mahogany back and sides and it sounds huge compared to its size! It has surprising projection while retaining the detail that's characteristic of a small body guitar. Includes a Collings hard case.