The Ernie Ball MusicMan EVH Bridge humbucker is made by DiMarzio and are only sold on Music Man guitars. The humbucker is found on the Ernie Ball MusicMan Edward Van Halen guitars and also the MusicMan Axis, the Albert Lee HH model and the AX40D (released under Ernie BAll's " Sterling brand. According to the DiMarzio website, the closest sounding pickup they have is the DiMarzio Tone Zone. The baseplate of the pickup usually has a B1 stamped on it. There are gold colored and black colored base plates.