With this bridge, you can modify your bass guitar to get a nice, mellow tone. This is a high-mass bridge which will lead to plenty of sustain. The included saddle inserts are brass for a distinctive sound. These notched inserts allow you to quickly change string spacing. This bridge was designed for a four-string bass guitar that features a standard, five-hole configuration. The design is based on a classic model that is highly sought after by bass players.