Martin FSC-Certified Concert Ukulele with Gig BagA uke for the planet, we have this Martin FSC Certified Concert Ukulele. Brought together by Martin's fine artistic eye and hand through FSC certified materials, this concert sized ukulele is a model to simply feel good about. FSC (Forest Stewardship Council) certified materials are vetted as being from responsibly sourced and maintained forests while producing exceptionally expressive music. Martin's history with ukuleles extends back generations.