Myles Music 4 String Bass Flat Pole Pickups Set, Ceramic Magnets For Jazz Bass -Magnet: Ceramic magnet -Pole piece: 9mm large pole piece -Plastic bobbin -Cover: Plastic, black color -Specifications: Wide frequency range J bass sound Neck: 3.0K 2.8H Bridge: 3.2K 3.0H -With mounting screws and springs