We manufacture Hawaiian Koa ukulele sets for Soprano, Concert, Tenor, Baritone and any other custom ukulele sizes. We specialize in large size and custom orders and will ship worldwide. We have decades of experience and know the issues to export around the world.

In addition to Hawaiian Koa, we produce ukulele sets made from Japanese tone woods Tochi, Sakura, and Persimmon through our sister company in Japan, Maikai Wood Hawaii - JAPAN. inquire or request a custom order.

We sell sets or lumber. Visit Grades of Koa page to learn more about our tonewood grading system.

Winkler Woods is capable to supply Hawaiian Koa ukulele sets as wholesale for business-to-business and retail for luthiers. Our sourcing of high grade and curly Hawaiian Koa came from the Big Island of Hawaii. We harvest and salvage Hawaiian Koa trees that were damaged by natural environmental factors, most of the time we can find them in the summits of Mauna Loa, then process the woods as logs to be turned into lumber, tonewood, and veneer. We do all the processing from green to final product in our workshop on Oahu, Hawaii. Since newly harvested Hawaiian Koa still has a high amount of moisture content within, we will then prepare the Koa wood for treatment and drying process. The time duration of drying and finishing "green" Koa can take up to six to eight months depending on the condition of the wood.

Our Hawaiian Koa tonewood for ukulele sets in different sizes such as soprano, concert, and tenor are cut quarter sawn and we measure their qualities by curl, size, figure, stripness and color. Koa wood is graded by strength and depth of curl or evidence of figure and character, this is our way to determine the grade level of a Koa tonewood piece. Master Grade 5A being the highest because of the tonewood's strong and deep curl within the template. A Koa tonewood with stronger and deeper curl is more expensive because it produce better sounds.

➤ Super Curl (Master Grade 5A) - Excellent, strong, deep curl no less than 90% and no blemishes within the template.
➤ High Curl - strong curl and figure, usually throughout the entire plate, generally visible from all angles.
➤ Medium Curl - pervasive curl yet may disappear or look stronger at certain angles or have bald spots.