I love music and I know how to play the guitar but I don't know some terms and functions of some parts of the instrument. Fortunately, my husband loves to play the guitar and know the parts very well so he explained to me its purposes. Just like the humbucker pickup covers where he said that that gives a good sound to the string of the guitar. But if you need replacement, it's best if it really fits on your instrument especially the holes. You can check on the internet to look for a better recommendation before buying a new replacement.