The Quantum humbucking neck and bridge pickups offer accelerated bass response for exceptionally fast tracking and precise articulation. A 5-way pickup selector switch is wired for series, parallel, and split configurations, thus offering a wide variety of sounds that can be adjusted using the guitar’s master volume and tone controls. Additionally, the RG421 is fitted with black hardware including a fixed bridge, as well as a set of standard die-cast tuners on the headstock.