This Soprano size ukulele is a 3 piece design: It has no conventional headstock i.e. headless, in order to minimize overall length. Instead, the tuning pegs are located at the tail end.It has a groove in the neck to accommodate a neck rod to stiffen it as most 3D printed plastic is too bendy under string tension. Use something like this for the in-neck rod: http://www.acpsales.com/.125-x-.325-Rectangular-Rod.html Also it is meant to be fitted with simple friction tuners like this: http://www.amazon.com/gp/product/B00E3UA3JQ OpenSCAD