Pole Pieces

The slug or polepiece material in humbuckers (or material and cast-type of magnets in single coils) can tailor your pickup to the sound you are after. Screws, hex bolts or rails are considerations too, and are available as well, in any combination. Hex screws generally have a little less bass than regular screws, while the rail design allows more consistent output if you bend strings a lot.  custompole.jpg