it's hard to see, but there's an opening for truss rod adjustment in the middle.
quote from the website:
The JAZZ FRAME for the use with medium or heavy gauge electric guitar strings, additionally equipped with an ebony covered magnetic pickup at the neck position - custom-made by HÄUSSEL PICKUPS.
Necks of the steel-string models are reinforced with a two-way adjustable truss rod. String action and intonation is adjustable via individual sliding bridge saddles. Frames meet the body at the 14th/18th fret, providing optimum access to the higher frets.
Refined fingerstyle techniques are aided by the wider fingerboard (45 mm at saddle), which uses the traditional 16 radius. Side dot markers provide easy fingerboard orientation.
Available with optional built-in MIDI access for connection to Guitar-to-MIDI converters.
