With the rise of Hawaiian music in the late 1910s, Martin began making ukuleles. The line expanded from mahogany to more elaborate Hawaiian koa models. A soprano-sized model, the 5K Uke is the ukulele equivalent of a Style 45 guitar—the top of the line. The 5K Uke is crafted with solid highly flamed Hawaiian koa top, back and sides finished in a polished gloss, and trimmed with abalone pearl appointments. High quality, beautiful tone and ease of playability make the 5K Uke a joy to own.