Take 2 clefts of willow, 1 is G1 and other is G3 or G4. G1 looks better than G4, they are both made to same weight, balance and pick-up, pressed equally well. Will they perform just the same? maybe, maybe not. If the bat maker deems the G4 is going perform just as well as G1 then sell it as Performance willow, get G1 money for a G4 bat, otherwise sell it as a G4. Don't mean to cause any offense but it seems more prevalent in small brands where as bigger brands like GM have a set standard for grading and stick to it (most times).