Kala's KA-BMB-S Soprano Ukulele is crafted from bamboo, the most eco-friendly wood choice for a ukulele. Highly renewable, bamboo regenerates quickly without being replanted. The many-layered, straight grain of the wood gives this collection a natural, earthy look. Bamboo provides a bright tone with great volume, harmonics, projection and sustain. The strength of bamboo makes for an extremely durable and resilient ukulele.