Seymour Duncan JB Jr Pickup Black Neck Twin-coil design pickup gives you the character of the JB model humbucker in a single-coil The SJBJ-1 guitar pickup features a twin coil design guitar pickup that gives you the character of our popular JB Model humbucker guitar pickup in a single coil size Its adjustable pole pieces more closely emulate the magnetic field of a full size humbucker guitar pickup and allow you to fine tune the balance of your strings: a first for a humbucker this size Available in black or white The SJBJ-1 guitar pickup features a twin coil design guitar pickup that gives you the character of our popular JB Model humbucker guitar pickup in a single coil size