Laka VUC90 ukulelė The Laka VUC90EA Electro-Acoustic Ukulele has a solid Koa top along with laminated Koa back and sides and a Mohogany/Nato neck with Grover machine heads. The Concert, or Alto size Ukulele as it is sometimes known is slightly larger than a Soprano Ukulele with a 15" scale compared to 13" Soprano and is not only larger in scale, but also in sound!