Hawaiian Koa 4A+ Curly Concert Ukulele Bookmatched Top Set #CT-TOP-058
■ Product Description
Hawaiian Koa 4A+ Curly
Concert Ukulele 2-Piece Bookmatched Top Set
Item Number: CT-TOP-058
This is a premium 4A+ (High-Mid Grade) Curly Hawaiian Koa set featuring the distinctive golden-to-brown natural coloration and strong, three-dimensional curly figure characteristic of high-grade Hawaiian Koa.
The beautiful curly figure changes dramatically with the viewing angle and light, revealing impressive depth, movement, and natural luster across the surface of the wood.
This 2-piece bookmatched set is sized for concert ukulele construction. It is listed as a Top set but may also be suitable for use as a Back set, depending on your instrument design and required dimensions.
The wood is sourced directly from suppliers on Hawaii Island and supplied as part of an ongoing reforestation project.
■ Grade
4A+ (High-Mid Grade) Curly
■ Scientific Name
Acacia koa
■ Set Contents
2 Top pieces (Bookmatched)
■ Size
Bookmatched Top
Approx. 310 × 220–265 × 3.2 mm
(Length × Width × Thickness)
Lower Width: Approx. 265 mm
Upper Width: Approx. 220 mm
The dimensions are measured with the bookmatched pieces opened and laid flat. These are not the dimensions of a single piece.
The upper section is narrower than the lower section. Please confirm that the available dimensions are suitable for your specific instrument design before purchasing.
Although listed as Top material, this set may also be used as Back material depending on your instrument design and required dimensions.
■ Wood Information
Species: Hawaiian Koa
Scientific Name: Acacia koa
Origin: Hawaii Island, State of Hawaii, USA
■ Features
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Premium 4A+ (High-Mid Grade) Curly Hawaiian Koa
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2-piece bookmatched set for concert ukulele construction
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Strong and beautiful three-dimensional curly figure
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Rich natural golden-to-brown coloration
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Suitable for use as either a Top or Back, depending on your design
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Excellent choice for high-grade custom ukulele construction
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Directly sourced from Hawaii Island
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Supplied as part of a reforestation project
■ Recommended Uses
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Concert ukulele construction
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Ukulele Top
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Ukulele Back
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Custom ukulele building
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Acoustic instrument making
A premium 4A+ Curly Hawaiian Koa bookmatched set featuring beautiful three-dimensional figure and rich natural coloration, ideal for a custom Concert Ukulele Top or Back.
KOA
What Is Hawaiian Koa?
Why Is Everyone So Fascinated by Koa?
What Is Koa?
Hawaiian Koa (Acacia koa) is a remarkable wood that has been treasured by the people of Hawaii for centuries.
Traditionally used for outrigger canoes, paddles, boxes, and furniture, Koa is now highly valued worldwide as a premium tonewood for ukuleles and guitars.
It is known for its rich, warm tonal character and distinctive natural beauty.
The Rarity of Hawaiian Koa
Hawaiian Koa is a tree species native to Hawaii, with a naturally limited geographic range and a finite supply of harvestable timber.
Historical logging and changes in land use have affected Koa forests. High-quality lumber displaying exceptional curly figure is particularly rare and highly sought after.
Today, forest conservation and reforestation initiatives are helping support the future of this valuable Hawaiian resource.
Our Koa Grading System
Our grading system is based on decades of experience in the wood industry. We evaluate Hawaiian Koa primarily by the strength, depth, and visibility of its curly figure, providing a consistent reference to help customers compare and select lumber.
Little or no curl,
with subtle figuring
Moderate curl
visible at certain angles
Prominent curl
visible from most angles
Deep, strong,
highly defined curl
Exceptionally rare,
outstanding curly figure
Note: These grades are based on our own grading standards. As Koa is a natural material, color, grain patterns, and the appearance of curl may vary depending on the individual piece and lighting conditions.
Moisture Content & Drying
Some of our lumber comes from naturally fallen trees or logs that have been drying for extended periods after harvesting. Moisture content varies from piece to piece. Some lumber may be ready for processing, while other pieces may require additional drying or acclimatization.
Careful drying and gradual moisture adjustment help minimize the risk of checking, cracking, and warping.
Stack Properly
Use stickers between boards to allow air to circulate freely.
Ensure Ventilation
Avoid direct sunlight and sudden changes in temperature or humidity.
Circulate Air
Use fans when necessary to maintain gentle and consistent airflow.
Minimize Warping
Stack lumber carefully and use appropriate weights when needed.
Recommended Uses
With its beautiful grain and excellent versatility, Hawaiian Koa is suitable for a wide range of applications, from fine musical instruments to decorative woodworking and handcrafted accessories.
Ukulele & Guitar Making
Knife & Tool Handles
Pens, Small Crafts & Inlays
Boxes & Fine Woodworking
Dimensions & Tolerances
Because wood is a natural material, actual dimensions may vary slightly. The following measurement tolerances may apply depending on the product.
| Thickness | ±0.2 mm |
|---|---|
| Length | ±5 cm |
| Width | ±3 mm |
Natural lumber may not be perfectly square or uniformly shaped. Please allow for the natural characteristics of wood. Dimensions and conditions specified on individual product pages take precedence.
Detailed information
Tree species: ハワイアンコア
Thickness:
Length:
Width:
Backing:
Number of leaves:
Made to order: KOA-CT-TOP-058
