- similar to the GRG170DX except in a smaller version, poplar (2006-07), mahogany (2008), or basswood (2009-present) body, fixed bridge, and pickguard like the GRX20, 22.2 in. scale, available in Black Night, Candy Apple (2007-08), Jewel Blue (2006-08), or White finish, mfg. 2006-present.