The patented G&L Magnetic Field Design® pickups use a ceramic bar magnet installed underneath each coil, with soft iron adjustable pole pieces to transfer the magnetic field to the top of the pickup. By contrast, traditional Alnico type pickups, such as used in the Legacy and George Fullerton models, use non-adjustable Alnico pole pieces leaving the only adjustment being pickup height. The Magnetic Field Design has this adjustment, but further offers individual adjustment of each pole piece, letting the player effectively adjust the output of each string on each pickup. Magnetic Field Design yield about twice the output per wind, making the pickup quieter while allowing a greater overall output. The sound of Magnetic Field pickups is slightly warmer with a broader frequency response.