Hawaiian Koa 5A+ Master Curly Soprano Ukulele Back & Side 4-Piece Set #KOA-SP-BS-013
■ Product Description
Hawaiian Koa 5A+ Master Curly
Soprano Ukulele Back & Side 4-Piece Set
Item Number: KOA-SP-BS-013
This is an exceptionally rare 5A+ (Premium Grade) Master Curly Hawaiian Koa set featuring the rich golden-to-brown natural coloration and outstanding figure characteristic of premium Hawaiian Koa.
The deep and powerful Master Curly figure comes dramatically to life as the viewing angle and light change, revealing exceptional three-dimensional depth, movement, and natural luster across the surface of the wood.
The Back and Side pieces have been carefully matched for grain pattern and color balance, creating a complete 4-piece set for soprano ukulele construction.
The exceptional figure of this top-tier 5A+ grade makes this set an excellent choice for creating a distinctive, visually impressive, and premium custom ukulele.
The wood is sourced directly from suppliers on Hawaii Island and supplied as part of an ongoing reforestation project.
■ Grade
5A+ (Premium Grade) Master Curly
■ Scientific Name
Acacia koa
■ Set Contents
2 Back pieces + 2 Side pieces
Total: 4-piece Back & Side set
■ Size
Bookmatched Back
Approx. 259 × 200–240 × 3.4 mm
Lower Width: 240 mm
Upper Width: 200 mm
Side
Approx. 361 × 59–70 × 2.9 mm
The dimensions for the Back are measured with the bookmatched pieces opened and laid flat. These are not the dimensions of a single piece.
When two width measurements are provided, the larger measurement refers to the lower end and the smaller measurement refers to the upper end.
■ Wood Information
Species: Hawaiian Koa
Scientific Name: Acacia koa
Origin: Hawaii Island, State of Hawaii, USA
■ Features
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Exceptional 5A+ (Premium Grade) Master Curly
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Deep and powerful three-dimensional figured grain
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Complete 4-piece Back & Side set
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Carefully selected for soprano ukulele construction
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Rich natural golden-to-brown coloration
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Dramatic Master Curly figure that changes beautifully with the viewing angle and light
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Excellent choice for premium 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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Soprano ukulele construction
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Premium custom ukulele building
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High-end acoustic instrument making
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Fine woodworking and craft projects
An exceptionally rare 5A+ Master Curly Hawaiian Koa Soprano Ukulele Back & Side 4-piece set featuring deep three-dimensional figure, rich natural coloration, and the distinctive beauty of genuine Hawaii Island Koa.
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
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: