C.F. Martin & Co C1K Koa Concert Uke

Essential Information About the C1K Koa Ukulele

• All koa (top, back, sides, and headstock) for a warm aesthetic and a lively response typical of this wood species.


• Concert size with a 15" / 381 mm scale length: more comfort and projection than a soprano, while remaining very compact.


• Careful craftsmanship: Sitka spruce bracing, dovetail neck/body joint, hand-polished finishes.


• Immediate comfort: Tusq nuts, 17 frets, and included gig bag for transport.

Koa: A Historic Signature in the Ukulele World

An iconic wood for Hawaiian instruments, koa is sought after for its balance between clarity, attack, and warmth, as well as its often spectacular grain patterns. On the C1K Koa, the presence of koa on the top, back, and sides aims for sonic and visual coherence, with a natural finish that highlights the wood grain.

For Which Musician and Styles?

Thanks to its concert ukulele format, the C1K Koa is suitable both for the beginner seeking a comfortable and rewarding instrument, and for the intermediate player looking for an expressive tone. It is particularly well-suited for pop/folk accompaniment, chord strumming, and gentle arpeggios, while remaining precise enough for light fingerstyle and solo melodies.

Sound Characteristics

The koa + concert size combination delivers a generally clear, responsive, and well-defined sound, with a bright attack ideal for highlighting rhythmic playing. The Sitka spruce bracing contributes to projection and top stability, while the "non-scalloped" construction favors a consistent response and good dynamic control. The Tusq nuts (headstock and bridge) promote efficient vibration transmission, providing precision and clean sustain for a ukulele of this size. The absence of electronics confirms a 100% acoustic approach, designed for natural playing and the richness of the wood.

Recommended Compatible Accessories

To preserve its acoustic qualities, you can opt for concert ukulele strings (15" / 381 mm scale), ideally fluorocarbon if you appreciate a clear attack and good intonation. A clip-on tuner is perfect for quick tuning adjustments. Since the gig bag is included, a universal ukulele stand is also a practical option for home or studio use.

Technical specifications

Category	concert	Tuning pegs	Open
Top	Koa	Bridge	Rosewood
Back&Sides	Koa	Nut	Tusq
Fingerboard	Rosewood	Cover/case	Cover
Nbrs of frets	17	Headstock	Koa
Scale (mm)	381 mm	Color	Natural

Body type	concert ukulele	Neck/body joint	dovetail
Back	koa	Scale length	15" / 381 mm
Sides	koa	Number of frets	17
Top bracing	Sitka spruce	Neck finish	hand-polished
Type of top bracing	concert ukulele, non-scalloped	Bridge saddle	white Tusq, flat
Rosette	multiple rings	Tuners	open gear
Top finish	hand-polished	Tuners finish	open gear, nickel, white
Back and sides finish	hand-polished	Strings	Ukulele Clear Fluorocarbon Soprano/Concert (M600)
Neck	mahogany	Electronics	not available
Neck profile	concert ukulele, standard heel