BUZZ FEITEN TUNING SYSTEM
The Buzz Feiten Tuning System solves tuning and intonation problems with 2 simple steps:
1. Shelf Nut
Their exclusive Buzz Feiten Tuning System¨ (BFTS) Shelf Nut moves the strings closer to the first fret according to their Patented Formula. This eliminates sharp notes at the first three frets. The strings are moved closer to the first fret a precise distance based on the scale length, fret width and string gauge of your guitar. The slight overhang of their nut (the 'Shelf') does this without altering your guitar in any way. So it's even fine for vintage guitars.
Your guitar's bridge is adjusted according to their Patented Pitch Offsets, creating balanced intonation over the entire fingerboard - every fret - every string.
You can find out more at buzzfeiten.com