This is a revolutionary string nut developed by Earvana. The patented technology is uniquely designed to improve the sound of your guitar. You have probably noticed that it is nearly impossible to tune your guitar so that all of the chords in the first 5 frets ring true and in tune. Earvana has solved this problem by developing a nut that compensates for the tuning errors that are inherent in 99% of all stringed instruments.
Comparison Chart
from Earvana:
This nut is easy to install yourself and requires no neck modifications! Available in Black or Ivory color. Neck width options are 1-5/8", 1-11/16" and 1-3/4". Available in Gibson® or Fender® retrofit designs.
Comes with nut pieces, mounting screws and instructions. Find detailed online installation instructions at http://www.earvana.com/EarvanaInstallation1.pdf.
Warmoth does not install these retrofit style Earvana nuts.