The JS20th features a basswood body bolted to a maple neck with a 22-fret rosewood fingerboard with pearloid dot position markers. Components include an Edge III double locking tremolo bridge with a locking nut and dual Ibanez Axis humbucking pickups. The JS20S is a mass-market version of the much more exclusive (and expensive) Japanese-made JS20th. Both models were produced to commemorate the 20th year of Satriani's relationship with Ibanez. The JS20S was offered only in 2008.