Gibson ABR-1 Tune-O-Matic Bridge ChromeThe Gibson ABR 1 Tune o matic bridge ensures accuracy in tuning, allowing players to adjust string height and intonation in minutes. Gibson Guitars is a household name because of its dedication to quality craftmanship. This dedication applies not only to the guitars, but to the whole line of parts that go into making them. Gibson Guitar parts are iconic and well known to be at the top of their class.