Giulio Negrini Guitars - GNG - GNG Brea PK2. The second model of @claudiopietronik 's Brea, year 2016, with sustainer and True Temperament frets for perfect intonation, standard intervals, just more precise
Negrini Guitars -GNG (@Neggiu) / Twitter
Giulio Negrini Guitars - GNG | Stabio
L'originalità estrema delle chitarre e dei bassi di Giulio Negrini (GNG) - Musicoff Community