Hex Ukulele OOO-series The Hex Ukulele OOO-series basically has all-solid-woods specifications. It has also been upgraded with advanced materials applied to ebony fretboard, ebony bridge, Grover tuners, bone nut, and saddle. Especially, the HG200U, also provided with the OOO-series, is a premium foam gig bag that features hard case level protection with sophisticated design. All-solid OOO-series is best for advanced users. HU1000 HU1000T PLUS OOO seriesUpdated on 2017-09-25T11:12:45+00:00, by hexguitars.