DiMarzio Fast Track 1 Single Coil Pickup - Black With hum-canceling side-by-side coils and twin-blade pole pieces, the Fast Track 1 dishes out solid single-coil tone with some distinct advantages The blade's magnetic field is continuous from end to end - no more strings misaligned over individual poles There's also less string pull, eliminating the out of tune sound caused when magnetic pull messes with the string vibration Most important is the sound The Fast Track 1 has the same open top- end as a single-coil with a tighter- more focussed bass response