Just so people know, Ill just throw this in for Noober here. The EG designation on the plug denotes it has a finer electrode piece which has less surface area to foul, so they are harder to foul.
However, they dont really seem to last any longer than a standard ES plug, so if you DONT have issues fouling plugs, I dont know if Id recommend switching to them. If youre fouling ES plugs, toss an EG in there and see. They supposedly work better for lower speed putt putt type stuff.