Martin Introduces Four New Acoustic Models: 5-28 Terz, OM-35 Inception™, Custom Shop 0-18 & Custom Shop 0-28

NAZARETH, PA – July 16, 2026 – C. F. Martin & Co.® introduces four new acoustic guitars that bring together history, innovation, and player-driven design: the 5-28 Terz, OM-35 Inception, Custom Shop 0-18, and Custom Shop 0-28. 

5-28 Terz 

Leading the launch is the return of the 5-28 Terz, a uniquely voiced Size 5 model and the smallest guitar currently offered by Martin. With roots reaching back to Martin’s earliest history, the Size 5 is the oldest Martin guitar body size still made today. Designed for Terz tuning—a minor third above standard—the 5-28 Terz delivers a focused, bell-like voice with surprising depth and shimmer. 

OM-35 Inception 

The OM-35 Inception continues Martin’s exploration of sustainable tonewoods, pairing black walnut and flamed American white oak with an FSC®-certified European spruce top. Purpose-built skeletonized Golden Era scalloped X-bracing enhances resonance, sustain, and dynamic response, creating a modern OM with a warm, clear voice and strong midrange character. 

Custom Shop 0-18 & 0-28 

Rounding out the offering are two new Custom Shop models designed as accessible gateways to Martin custom craftsmanship. The Custom Shop 0-18 pairs an Adirondack spruce top with genuine mahogany back and sides for an articulate, focused sound, while the Custom Shop 0-28 adds East Indian rosewood back and sides for deeper bass and richer overtones. 

Both feature hand-shaped Adirondack Golden Era scalloped bracing, vintage gloss finishes, and the intimate feel of Martin’s increasingly popular 0 body size.

Together, these four models give players new ways to explore Martin tone—from the historic sparkle of the 5-28 Terz to the sustainable innovation of the OM-35 Inception and the refined Custom Shop craftsmanship of the 0-18 and 0-28.

Availability 

The 5-28 Terz, OM-35 Inception, Custom Shop 0-18, and Custom Shop 0-28 are available beginning Thursday, July 16, 2026, through authorized Martin dealers and at martinguitar.com. 

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ABOUT C. F. MARTIN & CO. 

C.F. Martin & Co. has been making the finest handcrafted acoustic guitars for nearly two hundred years. For some of the biggest names and the most revered musical legends across every genre and every decade. And we’ve been doing it with pure artistic passion, a deep love for all things music, and an unwavering commitment to our community and the environment.

But most importantly, we’re still doing it... for you. For current and future generations of pioneers, rebels, and dreamers. For the beginners, the pros, and everyone in between. We believe music is an unstoppable force. It raises us up. Tells our truths. Gets us on our feet. Expresses our deepest heartaches. And our greatest joys. 

So, we’ll continue to make the very best acoustic instruments and strings for as long as there are people like you who love music and love making it. We want to be there to help you tell your story. To help you share your music with the world. To help unleash the artist within. 

We’re ready for the next two hundred years. Want to come with us? Visit martinguitar.com.