ハワイアンコア 4A+ カーリー ソプラノウクレレ トップ材 #SP-TOP-037
■ 商品説明文（Product Description）
Hawaiian Koa 4A+ Curly
Soprano Ukulele Top Material (Bookmatched Set of 2)
Product Number: SP-TOP-037
Rare 4A+ (Upper-Mid Grade) curly Hawaiian koa wood.
Features beautiful curly grain and the rich gold-to-brown color characteristic of Hawaiian koa.
The three-dimensional grain pattern appears to shift with changes in light, allowing you to enjoy the natural beauty of the wood.
This is a bookmatched set of 2 soprano ukulele top materials.
It can be used as top material or back material.
The wood is supplied directly from a supplier on the island of Hawaii as part of a reforestation project.
■ グレード / Grade
4A+ (Upper-Mid Grade) Curly
■ セット内容 / Set Contents
2 Top Plates (Bookmatched)
*Although sold as top material, it can also be used as back material.
■ サイズ / Size
Approx. 285×205–280×2.7mm
(Length × Width × Thickness)
*Sizes are for the bookmatched (opened) state. Not the size per single piece.
*Width is 280mm at the bottom and 205mm at the top.
■ 樹種情報 / Wood Information
Species: Hawaiian Koa
Scientific Name: Acacia koa
Origin: Hawaii Island, Hawaii State
■ 特徴 / Features
・Rare 4A+ (Upper-Mid Grade) curly grain
・Bookmatched top material ideal for soprano ukulele crafting
・Beautiful natural gold-to-brown color
・Three-dimensional figured grain
・Can be used for both top and back material
・Direct from Hawaii Island, reforestation project material
■ 用途 / Recommended Uses
・Soprano ukulele crafting
・Ukulele back material
・Musical instrument crafting
・Woodworking and craft production
High-quality Hawaiian koa soprano ukulele top material with beautiful curly grain.
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: hawaiian koa
Usage: ukulele
Ukulele size: soprano
Ukulele set:
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: