If your asking me what my FOC is with the nocks installed, I don't know yet. I just got these arrows and I haven't measured it yet. Obviously it has moved to the rear, but like I said I have no problem with flight or grouping out to 35 yards (that's about as far as I can shoot in the back yard). Since I usually try to keep my shots on deer to 30 yards or less, that's good enough for me.