The calibrated Alnico 5 magnets of the Antiquity II Firebird vintage mini humbucker bridge pickup give the treble response an edgy sparkle—like an overwound single-coil—and the classic coil wind gives the bass response a humbucker-like tightness. The result is a pickup that sounds like the perfect cross between a single-coil and a humbucker with a growling tone. The Antiquity II Firebird pickup is a drop-in replacement for Gibson Firebirds or any mini humbucker-equipped guitar, and it mounts with a standard Firebird mounting ring and 3-48 mounting screw, like the originals.