The modern iteration of the Martin 000-18 auditorium-style acoustic guitar was born when the company first changed the original design from 12-frets to 14. Since the 1934 design change, the 000-18 acoustic has been in continuous production and is considered one of Martin's most popular auditorium-sized acoustic guitars. With its mahogany body and small size, the 000-18 is considered a great guitar for fingerpickers.