Aquila USA 110U High G Soprano Ukulele Set - All Lava Nylgut Series strings maintain thesame identical mechanical and sound proprieties of Aquila's famous white-pearlSupernylgut ukulele strings. Enjoy it! Set / Soprano Ukulele g' c' e' a' - Regular Tuning, Key of CMade of SUPER NYLGUTColour:grey-black withmother-of-pearl shimmerAquila LAVA SERIES for ukulele - A grey-black string coloured with a touch of mother-of-pearl inspired by volcanic rocks. Aquila's Lava Series, naturally inspired by volcano, an hawaiian symbol of new life, is the respectful homage to the hawaiian people who made the ukulele worldwide famous and share their happiness with thousand of people all around the world. The Lava