Hex Ukulele O-series The Hex Ukulele O-series focuses on the basics at an affordable price. The pursuit of making high-quality ukuleles at affordable prices originated from the know-how of efficient process management and securing large quantities of good materials. Basically, the level of the sound wood used in the middle of the three-layered body wood is raised one level, so that the sound quality of the main wood is expressed clearly. The Hex ukulele O-series offers the best combination of durability, affordability, and sound quality. HU10 HU10 plus HU10LS HU20 HU20 plus HU40 HU60 HU90 O seriesUpdated on 2017-09-25T09:58:10+00:00, by hexguitars.