This pickup is for bassists who want maximum output and an extended frequency range. The 1/4" diameter pole pieces expand the magnetic field and extend the frequency range from low to high end for a fat, full, punchy sound with a present midrange. The Seymourized design balances the coils against the magnets for great sustain and harmonics. The two coils are wired in a humbucking mode to eliminate interference hum. This pickup is a direct replacement and requires no bass guitar modifications. Wiring schematic and mounting hardware included. Hand built in Santa Barbara, California.