"Think about this>> If you rapidly accelerate a long slim object that has mass in the front from a position at rest... the result is resistance... we have all seen it in videos.... the arrow buckles as the mass is suddenly shoved into motion. Now think about it..... we have a long slim arrow that has a higher mass in the front than anywhere else. HMMMMM>>> How and what does NuFletch offer to change this? Take the same length slim object...cut if off 2 3/4" (stiffen the shaft) install an aluminum insert into the tail, (stiffen the tail even more) add an aluminum ferrule (stiffen it more) then move the mass from say 12% back to 3-4% over center. FIRE again.... the stiffer shorter in carbon only... (but same length arrow as we first fired because of the addition of the NuFletch ferrule) again resists the immediate motion... this time however... the mass is closer to the middle so the resistance arc is much shorter...this short oscillation arc, "compared to the original higher oscillation arc" recovers almost immediately.... now the arrow flies down range without the heavy oscillation.... WHAT....are you suggesting that the arrow does not need to be FOC forward??????... NO>>>> I am proving that without the heavy oscillation present in the flight downrange, the arrow will fly more efficiently (less oscillation) and now has the ability to carry the extra weight we all freak out about downrange. The NuFletch arrow does not require the mass on the front to correct its oscillation cycle. The NuFletch arrow will deliver the extra weight downrange effectively because it flies with less movement (oscillation). The NuFletch arrow will continue downrange with less drag from oscillation and deliver the punch we require as hunters because the added weight of the arrow puts more mass in motion."
This is from a NuFletch employee that posted on ArcheryTalk. Also on average they add about 50 grains to your arrow.