are knife edge based. Prestige series The S-Prestige is the high end, "premium" S series. Between 2005 and 2008, S Prestige guitars were made in Korea. In 2009, production was moved back to Japan. S 7 string series Ibanez re-introduced the Ibanez S 7 string due to popular demand in 2007. A similar model had been discontinued and 7 string models were left to the RG series and some signature guitars. The first in the series, the S7320 sported all the same basic features as the non-Prestige models of the S Series (22 frets, Wizard-II neck, thin contoured mahogany body, ZR tremolo, jumbo frets) but had a different pickup configuration consisting of 2 Ibanez Axis Humbuckers, the AH1 and AH2, no middle pickup, but a 5 way selector giving the user the choice of Bridge, Bridge and neck split coils in parallel, Bridge and Neck humbuckers in parallel, Neck in parallel, and Neck, giving a wide array of tonal variations. In 2010, they replaced it with the S7420, which is similar except for the addition of a 24 fret fingerboard. SZ series The Ibanez SZ series is a derivative model of the S series. Guitars of this series feature a thicker and heavier body than the normal S series, hardtail bridges, maple tops (on most models) and a shorter 25.1" set-in neck. Unlike the S or SA, it has a 3-way selector switch, at which the mid position is two single-coil (inner coils of the humbuckers) instead. SZR series The Ibanez SZR series is a series introduced in 2008 to replace the SZ. Like the SZ, it has a thicker and heavier body and an even shorter 24.75" set-in neck, similar to Gibson guitars. Otherwise, it is identical to the SZ, with 2 tone knobs and a 3-way selector switch, at which the mid position is both humbuckers in split coil mode using the inner coils. The SZR series was discontinued in 2010. SA series The SA series is a different variant of the S series. Its S-based body has a flat back and an arched top, as opposed to the carved top and back of the normal S series. It also utilizes the SAT single-locking floating tremolo that only locks at the bridge, as opposed to the ZR and Edge tremolos, with which normal S series guitars are equipped. Prior to 2008 series, SA is the only standard (non-budget)