The GZR P Bass Pickups were developed by EMG with legendary bassist Geezer Butler, they worked to create a passive pickup with a truly vintage tone an feel, recapturing his early Black Sabbath tone. It uses Alnico V pole pieces and custom wound coils for just the right amount of punch and grit with a deep, tight low end. The pickup features their solderless system for quick and easy installation, it comes with everything you need including a 250k volume and a 250k tone pot (solid shaft), mono output jack and all required connector wires.