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.
Why Is Everyone Obsessed with Koa?
You may often hear people talk about “Koa,” but what exactly is it?
Hawaiian Koa is one of the most prized and iconic tonewoods in the world, valued for both its beauty and sound quality.
About Hawaiian Koa Wood
Hawaiian Koa (Acacia koa)
Hawaiian Koa is a special wood that has been treasured by the Hawaiian people for hundreds of years.
Historically, it was used to make:
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Outrigger canoes
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Paddles
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Boxes
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Furniture
Today, Hawaiian Koa is highly regarded worldwide as a premium material for musical instruments such as ukuleles and guitars.
It is known as an excellent tonewood, producing a rich, warm, and balanced tone with beautiful visual character.
About Scarcity
Hawaiian Koa has a very limited supply due to extensive logging in the past.
Large-scale reforestation efforts have only begun relatively recently.
As a result, high-quality Hawaiian Koa is becoming increasingly rare every year, especially highly figured material.
About Grading
Grading Information
Our grading system is based on over 50 years of experience handling and supplying tonewood.
It is our own internal quality standard.
In the general market, terms such as “4A” and “5A” are widely used, but grading criteria vary from company to company.
By understanding our grading system, you can be confident that each grade meets a consistent and reliable quality level.
Grade Criteria (Simple)
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1A–2A: No curl to very weak curl
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3A: Medium curl visible at certain angles
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4A: Strong curl visible from any angle
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5A: Master grade with deep, beautiful curl
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5A+: Extremely rare, top-tier figure
Moisture Content & Drying
Our wood comes from naturally fallen trees or logs that have been air-dried in the forest for long periods.
Because of this, some pieces are ready to use, while others may require additional drying.
Hawaiian Koa is known as a wood that dries easily and is resistant to cracking and warping compared to many other tonewoods.
Easy Drying Method
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Place the wood so air can circulate freely
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Store in a well-ventilated area
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Use a fan to circulate air if needed
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Place a light weight on top to reduce movement
For material 20–30 mm thick, the recommended drying period is approximately 2 months in a well-ventilated environment.
Recommended Uses
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Ukulele making
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Knife and tool handles
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Pens, accessories, and inlays
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Box and small craft production
Measurement Notes
Because this is a natural wood product, the following dimensional variations may occur:
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Thickness: ±0.2 mm
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Length: ±5 cm
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Width: ±3 mm
The material is not a perfect rectangular prism, which is a natural characteristic of solid wood.
Please understand this before purchasing or processing.
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