It had a version of Floyd Rose tremolo's bridge. It had 24 frets. YAMAHA produced the RGX 421 D between 1994 and 1998. Features H-S-H Pickup's layout design: a humbucker the bridge for fat lead tones, a single-coil in the middle position for traditional Stratocaster tones and a humbucker in the neck, for treble tones. It had a version of Floyd Rose tremolo's bridge. It had 24 frets. The RGX 621D was discontinued in 1995. The RGX 621D's pickups were directly mounted to the guitar's body. The RGX 621D model had a custom scalloped fretboard from the 20th to the 24th frets. This feature was intended to help fast and accurate fingering. The RGX 621D had a Yamaha height-adjustable locking nut. This allowed players to customize the action and feel of their guitar based on playing style and string gauge preference. The body was alder. The neck was maple, with 24 fret rosewood fingerboard. Pickups were two humbuckers (neck and bridge positions) and one single coil (middle position). The controls were a five position pickup selector and master volume and master tone controls. The bridge was a TRS-Pro locking tremolo. All hardware was black chrome finished. Finish options were Antique Sunburst Satin, Black, Blue Metallic, Red Metallic and Natural Satin  The RGX 820 R was made between 1993 and 1995. The RGX 821 was made between 1994 and 1996. The RGX 821 / 821D was one of the most expensive guitars in the Yamaha RGX series, selling for around $1000 when new. The RGX 821 pickups were directly mounted to the guitar's body. The RGX 821D and 621D model variants had custom scalloped fretboards from the 20th to the 24th frets. This feature was intended to help fast and accurate fingering. The RGX 821D had a Yamaha height-adjustable locking nut. This allowed players to customize the action and feel of their guitar based on playing style and string gauge preference. The body was alder with figured Veneer. The neck was maple, with 24 fret rosewood fingerboard. Pickups were two humbuckers (neck and bridge positions) and one single coil (middle position). The controls were a five position pickup selector and master volume and master tone controls.