KALA KA-BMB-C SOLID BAMBOO CONCERT - Sold Bamboo Top, Back & Sides - Bamboo Neck & Fingerboard - Slotted Headstock - Graph Tech NuBone® Nut/Saddle - Satin Finish - Bamboo is the most eco-friendly wood choice for a ukulele. Highly renewable! The many-layered, straight grain of the wood gives this ukulele a natural, earthy look. Bamboo provides a bright tone with great volume, harmonics, projection and sustain.