Aloha!  Please email for your needs and we can make an appt for you to stop by  our place in Wahiawa behind Bello’s Millwork.  We don’t keep a lot of stock there so please email ahead.  Mahalo.

EMAIL: inquiry “at-mark” winklerwoods.com You may also CALL: 808-591-8144

Koa Grades
Koa Grading 1A - 5A Examples

Hawaiian Koa Grading  for instruments – please have a look at the photo above and you can see the wood grain range from the left to right from NON (1A) curly to SUPER (5A) curly.    I adopted this grading system from the Maple, Spruce and Cedar market (thanks Dave!) in order to have a base line grading system when trying to sell koa in the instrument market.   My father had his grading system for lumber that was adopted from NHLA grading rules, but that just didn’t work when speaking luthiery.   While not perfect, I found this does help our buyers understand what to expect from us.   We do our best to match the buyer’s expectations with what we promise to supply.

Koa is generally graded by strength and depth of curl or evidence of figure and character:  fancier wood = higher grade

All grading is within the template of the instrument supplied.

Color is not a grading factor for us and koa can range from a very light, golden color to a deep chocolate brown or red.

1A/2A    no or light curl; has vertical grain cut (quarter-sawn) and little to no runoff at the edges.

3A         sometimes strong a localized curl; pervasive curl yet may disappear or look stronger at certain angles and will have bald spots; usually not so strong until the finish is applied;  most difficult grade to see on rough boards, without water or sun.

4A         strong curl and figure maybe 70-90% of the entire plate with small bald spots here and there, generally visible from all angles

5A         “Master grade”; excellent, strong, deep curl with no blemishes within the plate.   Not all 5A is equal…  and one 5A could be more or less expensive than another, even at the wholesale level.

Log prices fluctuate wildly these days which means the prices will as well so please understand it is really about good ‘ol economics on what we can offer.  sometimes we have lots for reasonable prices and sometimes hardly any at all and expensive.

We are a wholesale and retail supplier capable of supply one to 1,000’s of sets. We stock sets and lumber. We do all the processing from green to final product on the Big Island and on Oahu.   Please email for availability.   Please note we have down-sized a lot and don’t keep a lot of stock on hand so please email before coming by to be sure we have what you are after.   Mostly I keep a bit of figure koa, curly mango and beautiful monkey pod on stock.

NOTE: We are NOT on Waimanu St. anymore and are in Wahiawa at 401 N. Cane St behind Bello’s Millwork.

** Instrument grade (QUARTER-SAWN FIGURED) Koa is sold in SET & LUMBER form; please email for custom quote. We do not email price lists.


Name Description Products
Lumber Instrument
Veneers Flooring Moldings
KOA Hawaiian Koa (ACACIA KOA) aka “Hawaiian Koa” is the main wood we supply in various forms. Our koa originates from the Big Island of Hawaii from the slopes of Mauna Loa and Mauna Kea. Koa is the premier hardwood of Hawaii and ranges in price from affordable to astronomical!

in stock in stock in stock some Lumber only
MANGO MANGIFERA INDICA — Mango is a large tree often reaching 65 feet in height and 3 feet in diameter. The wood has been used in Hawai’i for carved and turned bowls and furniture.

in stock in stock in stock order Lumber Only
‘OHI‘A METROSIDEROS POLYMORPHA — The ‘Ohi’a is unique to Hawai’i. It is one of the trees initially used by native Hawaiians for critical construction applications such as tools, and wear-strips along the gunwales of canoes.

very limited Not used as a tonewood in stock order Lumber Only
CUBAN MAHOGANY SWIETENIA MAHOGANI — Cuban mahogany is the first discovered species of mahogany. It was introduced to Hawai’i in the early 1900s, and is widely planted in both public and private forest stands. It has been used in various locations as a stately street tree.

limited – amazing Tonewood IN STOCK rare rare limited in lumber only

I have some in veneer only- please call for availability; we do not supply lumber or other forms of these woods

name Description
BLOODWOOD BROSIMUM PARAENSE — Bloodwood is a dark red wood.

CHOCOLATE HEART, Albizia — Albizia “Chocolate Heart” is mostly a “weed tree” fast-growing but some are darker and called “chocolate heart” which can sometimes be confused with koa and is very beautiful, but slightly toxic dust so take care when working with it.

KAMANI CALOPHYLLUM INOPHYLLUM — Kamani grows near the seashore, and reaches heights of 40 to 60 feet, diameters up to 36 inches. The heartwood is reddish brown, with a moderate density (specific gravity .6). It was traditionally used for bowls.

The wood is lustrous and the interlocking grain shows a dramatic braided ribbon stripe on the quarter sawn face.

MILO THESPESIA POPULNEA — Milo is a medium-sized lowland tree attaining 30 feet in height, with a trunk diameter of 8 to 20 inches. This slow-growing, taste-free and insect-resistant wood has been used historically by native Hawaiians in the making of food containers and in boat building. It has light brown sapwood, clearly defined from the reddish/chocolate brown heartwood.

OHAI(Monky Pod) SAMANEA SAMAN — Ohai or Monkey Pod is Commonly planted for shade and wood.  A beautiful shade tree, introduced to Hawaii in 1847, with large trunk and very broad arched crown of dense foliage. Trees can achieve heights of 50-75 feet, with a relatively short trunk of 2-4 feet in diameter.  These are the trees in the Hitachi commercial in Japan that are found in Moanalua Garden’s Park.

SILKY OAK GREVILLEA ROBUSTA — Silk-oak, commonly called “silky oak”, was introduced for shade, ornament and reforestation. It may reach 70 feet in height with a diameter of up to 3 feet. The wood was traditionally referred to as “lacewood” in its native Australia, and is now scarce there. It is moderately dense (specific gravity .57).

SUGI (Japanese Ceder) CRYPTOMERIA JAPONICA — Sugi, often called Sugi pine yet is really a true aromatic cedar, is an aromatic softwood native to Japan. The sapwood is white or yellow, with reddish brown heartwood. The wood is light (specific gravity .41). It has strength properties similar to western red cedar, and is suitable for aromatic drawer linings.

TOON TOONA CILIATA — Toon was introduced in 1918 for plantation use. It grows to 50 feet tall and reaches over two feet in diameter. The wood is very lightweight (specific gravity .35), and is reddish brown. The tree is also called “Australian red cedar”, because of the strong aromatic cedar scent of the wood.