The GRG121EX is an RG series solid body electric guitar model introduced by Ibanez in 2015. It is made in China as part of the entry-level GIO line. This model replaces an earlier version.
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.
For 2018 the rosewood fretboard was replaced with treated New Zealand pine.
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. The GRG121EXSM is a similar model with a spalted maple top.
The GRG121EX was discontinued after 2018
 
Specifications for GRG121EX (2015–2018)
Year(s) offered: 2015–2018
Sold in: North & South America and Oceania
Made in: China
Finish(es): Black Night (BKN) 2016–2018 / Metallic Silver Sunburst (MSS) 2015
Body
Body type:
Solid body
Body material:
Poplar
Neck joint:
AANJ
Bridge:
Fixed bridge
Knob style:
Metal dome
Hardware color:
Black
Neck
Neck type:
GRG
Neck material:
1-piece maple
Scale length:
648mm/ 25½"
Fingerboard material:
2015–2017: Rosewood
2018: Treated New Zealand pine
Fingerboard inlays:
White dot
Frets:
24 / jumbo
Nut:
Black plastic (43mm)
Machine heads:
Ibanez die-cast, small buttons
Electronics/ Strings
Pickup configuration:
HH
Bridge pickup:
Ibanez Infinity R (H)
Neck pickup:
Ibanez Infinity R (H)
Controls:
Single volume / 3-way toggle pickup selector
String gauge (factory):
.009–.042