The bracelets have many layers of protective finish on the outside and the wood is left to breath on the inside.
The koa tree is endemic to Hawaii and grows in many colors ranging from very light, deep red, and dark chocolate browns; and grain figure which ranges from plain and fancy, to the more spectacular and rare curly and fiddleback grains. Hawaiians used it to make their canoes, paddles and surfboards. Koa wood is one of Hawaii’s greatest natural resources and possibly the most expensive wood in the world. The koa wood you see today was either cut long ago, is windfall, or milled from dead trees. It is on the comeback due to considerable conservation efforts.