The fretboard is a construct of Tolgahan Çoğulu and Süleyman Hakan Görener in the Republic of Türkiye. Unlike the standard straight-line positioning of frets under all strings, this fretboard comprises six 'fretlets' that sit in channels under each string. This distinctive configuration provides an open-ended intonation across the full range of the guitar.

The fretboard is attached to a PRS-style Carved Top Guitar Kit that I built at Wood and Strings in South Australia.

It is tuned in Just Intonation, a form of microtonality where the musical intervals are created by whole number ratios from a fundamental pitch. Below are the fretting positions based on fundamentals of D (l) and A (r).

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D 1/1, Eb 16/15, E 9/8, F 6/5, F# 5/4, G 4/3, G# 7/5 A 3/2, Bb 8/5, B 5/3, C 9/5, C# 15/8, D 2/1.​

A 1/1, Bb 21/20, B 9/8, C 6/5, C# 5/4, D 4/3, D# 7/5, E 3/2, F 8/5, F# 5/4, G 7/4, G# 40/21.