Here is a SI Super Concert from local luthier Mr. Ishikawa of Honolulu. The body of this ukulele is all solid curly koa construction. It has a mahogany neck and rosewood fretboard. There is a rosette of abalone, and gotoh tuners. This ukulele has a very solid feel and sound. Out of the SI family of ukuleles, I believe that I prefer this model. It sounds great, and looks great too.