PR-06 titanium saddles are pre-assembled with zinc die cast base. This bridge base is not Gibson®'s original parts. But it can be used as a replacement for the original Nashville Tune-O-Matic Bridge. Also you can use this bridge on some of other manufacturer's guitar which has a Tune-O-Matic Bridge. Please refer to the drawing, and check the size of your bridge. Chrome and Nickel plated bridge bases are also available, but the saddles are not plated.