Seymour Duncan SJM-3 Quarter-Pound Jazzmaster Pickup, Black Neck Every detail in sound, construction and appearance is faithfully duplicated in these replacement pickups On all Jazzmaster replacement pickups, the neck version is reverse wound/reverse polarity (RW/RP) to create a humbucking effect when used together with the bridge model This pickup was designed for players who need full frequency response with maximum output Featuring hand-polished, 1/4"-wide magnets combined with a custom coil wind with more sustain for lead work This pickup was designed for players who need full frequency response with maximum output