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The G strumsticks are a shorter than the D, are tuned higher, and have a brighter, ringing tone.  Several body sizes (G-24 KidPicker, G-29 SlimPicker, G-31 Super G)  See Specs and Details on each model's page. Here is a video comparing the D and the G Strumsticks. Ultimately, it is good to have both, for their different sounds.