The RG5-150, which is also referred to as the IRG720, is an RG series solid body electric guitar model introduced by Ibanez in 1995. It was made in Japan by FujiGen and was a spot model which was offered exclusively by Japanese music retailer Ishibashi.
The RG5-150 features a thick flamed maple top with natural binding on a mahogany (or alder?) body bolted to a maple Wizard II neck with a 24-fret maple fingerboard with black dot position markers. Components include dual DiMarzio humbucking pickups, a Lo Pro Edge double locking tremolo bridge and Gotoh tuning machines.
The RG3120 which arrived in 1997 is a quite similar guitar with a rosewood fretboard and a different neck.