Martin Custom Shop 000 Size 18 Style w/ Sinker Mahogany, Swiss SpruceA Martin Custom Shop acoustic guitar is shrouded in excellence through individual craftsmanship, tonality, and worth as a lifetime investment. This guitar, a Custom 000 18, was commissioned by Russo Music. To the plain eye, we see a standard fare 000 18 which of course is the classic spruce mahogany orchestra style acoustic from the company. However, this 000 18 features two distinct tonewoods: Sinker Mahogany from Belize, and Swiss Spruce. High