- fret bars
The strips of metal found along the fingerboard. The space immediately behind the fret bar is used for fretting (not directly over the bar). Fret bars are placed at set intervals to divide the string into pitches. The frets get closer together as you ascend the fretboard; this is because every time you halve the length you raise the pitch by an octave. Fret 12 divides the string in half (raising the pitch by an octave) and fret 24 divides the string into a quarter (raising the pitch by another octave).