The AU series features a very unique construction. Rather than being built with a separate top, sides, and back like most ukuleles, the body of the AU starts as a solid block of wood and is routed out, so that the back and sides are a single piece of wood. A top is then added to complete the body. This construction method gives these instruments a unique sound and brilliant playability. They also utilize distinctive features such as a Stereo Sound Port, Elevated Comfort Armrest, and Edgeless Comfort Heel. Specifications SeriesAU Number of strings4 ColorOpen Pore Natural Body shapeAU tenor Body topSpruce Body sidesSolid Paulownia Body backSolid Paulownia Body finishOpen Pore Polyurethane NeckOkoume Scale (inch)17 Scale (mm)432 Neck typeAUT Neck thickness (1st fret, mm)19 Neck thickness (7th fret, mm)21,4 Neck finishOpen Pore Polyurethane Neck jointDowel jointing Neck joint position14th fret joint NutPlastic Nut width (mm)37 End width (mm)47 at 14F FretboardPurpleheart Fretboard radius (mm)400 InlayWhite dot Number of frets19 BridgePurpleheart double hole SaddlePlastic String spacing (mm)15 Machine headsBlack Die-cast tuners String gauges (from top to bottom).026/.033/.039/.029 Tuning (from top to bottom)1A,2E,3C,4G Special feature 1Stereo Sound Port System Special feature 2Elevated Comfort Armrest Special feature 3Beveled Cutaway Special feature 4Edgeless Comfort Heel Special feature 5Chambered body (Acoustic) Made inChina Case or bag includedGig bag included Other item(s) includedUkulele starting guide, Aguila tag, Manual Total length (mm)665 Body length (mm)300 Body Width (mm)225 Body thickness (mm)64,6