Fanned frets look like a modern addition to the world of guitars but they actually appear on stringed instruments from over 150 years ago. The offset frets are used to create a multi scale fretboard. The benefit of doing this increases the tension of the bass strings allowing heavier strings to be used if you prefer a heavier tone. The tension of the lighter strings are reduced therefore making it easier to bend strings. Fanned frets are also considered to improve the guitars intonation.