Hawaiian Koa 4A Curly Soprano Ukulele Back & Side 4-Piece Set #KOA-SP-BS-017
■ Product Description
Hawaiian Koa 4A Curly
Soprano Ukulele Back & Side 4-Piece Set
Item Number: KOA-SP-BS-017
This premium set features rare 4A (High-Mid Grade) Curly Hawaiian Koa (Acacia koa) from Hawaii Island, selected for Soprano Ukulele construction.
The wood features the distinctive golden-to-brown natural coloration of Hawaiian Koa, combined with strong, three-dimensional curly figure that becomes especially prominent as the viewing angle and light change.
This 4-piece set includes two bookmatched Back pieces and two Side pieces. The Back measures approximately 270 mm long, with a width of approximately 205 mm at the lower section and 180 mm at the upper section. The Sides measure approximately 405 mm long and 70 mm wide.
The impressive curly figure and rich natural coloration make this set an excellent choice for high-grade custom Soprano Ukulele construction, where the visual character of the wood is an important part of the finished instrument.
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
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2 Back pieces (Bookmatched)
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2 Side pieces
Total: 4 Pieces
■ Size
Bookmatched Back
Approx. 270 × 180–205 × 4.0 mm
Width: Approx. 205 mm at the lower section / 180 mm at the upper section
Side
Approx. 405 × 70 × 3.6 mm
(Length × Width × Thickness)
The Back dimensions are measured with the bookmatched pieces opened and laid flat. These are not the dimensions of a single piece.
The Back width varies depending on the section of the wood. Please confirm that the available dimensions are suitable for your instrument design before purchasing.
■ Wood Information
Species: Hawaiian Koa
Scientific Name: Acacia koa
Origin: Hawaii Island, State of Hawaii, USA
■ Features
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Rare 4A (High-Mid Grade) Curly Hawaiian Koa
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Complete 4-piece Back & Side set for Soprano Ukulele construction
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Bookmatched Back
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Back measures approximately 270 mm long
-
Back width: Approx. 205 mm lower / 180 mm upper
-
Side pieces measure approximately 405 mm long × 70 mm wide
-
Beautiful natural golden-to-brown coloration
-
Strong, three-dimensional curly figure that changes with the viewing angle and light
-
Excellent choice for high-grade custom Soprano Ukulele construction
-
Directly sourced from Hawaii Island
-
Supplied as part of a reforestation project
■ Recommended Uses
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Soprano Ukulele construction
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High-grade custom ukulele building
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Ukulele Back
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Ukulele Sides
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Acoustic instrument making
A premium 4A Curly Hawaiian Koa 4-piece Back & Side set for Soprano Ukulele construction, featuring strong three-dimensional curly figure, rich golden-to-brown coloration, and practical dimensions for a high-grade custom instrument.
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
Usage: ウクレレ
Ukulele size: ソプラノ
Ukulele set: バック、サイド
Guitar size:
Guitar set:
Guitar grade:
Color:
Format:
Striped pattern:
Dimensions of top thickness:
Top width:
Top length:
Back thickness:
Back width:
Back length:
Side thickness:
Side width:
Site length:
