This GRG121EX differs from earlier versions in that it has only a single knob (for volume) and a 3-way pickup selector toggle as well as a poplar body. Earlier versions had a tone control and a 3-way lever selector with a basswood body. The GRG121EX features a poplar body bolted to a maple neck with a 24-fret rosewood fretboard with dot position markers. Components include a fixed bridge and dual Ibanez Infinty R humbucking pickups. The GRG121SP is a version available only in 2015 which had a cheetah-patterned pickguard. The GRG121EXS is a similar model with a decorative top.