jack connection (6,3 mm) for "regular" pickups, bigger volume knob, 5- and 6-string basses, fits for all 4-, adjustabl lenght for the pickup cable, Updates to the: 30% smaller size, the distance of the magnets by themself kann be adjusted to the string spacing of the bass (from 19mm "Jazzbass" till 16mm "6-string"). included assembly kit