This koa and create blue opal wood ring is made from genuine wood and cast in titanium. Designed for those who live an active lifestyle, the wood used in these rings goes through a special setting process that makes them completely water proof. Perfect for surfers, boaters, paddle boarders, fishers, outdoor enthusiasts, or those who simply enjoy the natural beauty of real wood jewelry. This style has an 8mm width. Made in Hawaii, USA by Alamea the premier exotic wood jewelry manufacturer.