It was introduced as a seven-string variant of the JBM20 which is a mass-market version of Bowen's PrestigeJBM100.
The JBM27 features a mahogany body with a maple top bolted to a maple neck with a reversed headstock and a 24-fret rosewood fingerboard with binding and a special moon inlay at the 12th fret. Components include dual DiMarzio custom humbucking pickups, an Edge Zero II double locking tremolo bridge, a locking nut and locking Gotoh tuning machines.
For 2018 the rosewood fretboard was replaced with jatoba. For 2019 the mahogany body was replaced by nyatoh. For 2021 the neck was changed to maple and bubinga and the rosewood fretboard returned.