A humbucking pickup, humbucker, or double coil, is a type of guitar pickup that uses two coils to cancel out the interference picked up by coil pickups caused by electromagnetic interference, particularly mains hum. Most pickups use magnets to produce a magnetic field around the strings, and induce an electrical current in the surrounding coils as the strings vibrate (a notable exception is the piezoelectric pickup). Humbuckers work by pairing a coil that has the north poles of its magnets oriented "up" (toward the strings) with another coil right next to it with the south pole of its magnets oriented up. By connecting the coils together out of phase, the interference is significantly reduced via phase cancellation: the string signals from both coils add up instead of canceling, because th