The Andis reSURGE Shaver Replacement Cutters and Foil is the latest product changing the game in barber products. It's an easy and reliable product that adds the finishing touch to any haircut. It creates a smooth finish with razor precision. Hypoallergenic, giving less irritation on the skin. How to install & replace foil assembly & inner cutters: To replace cutters: NOTE: Always replace the foil assembly when replacing the cutters. To remove a cutter, grasp it on both sides and pull up. To replace a cutter, line up the small metal shaft with the notch on the shaver drive and push down firmly until it snaps into place. To reinstall foil assembly: Gently slide the new foil assembly down over the cutters until it snaps firmly into place.