This applying pack provides all the tools you need to apply the pre-bonded hair extension on. There are three kinds of items contained in this pack: Re bonds: Made by keratin glue and there are 50 pieces in each bag. Used to re apply pre-bonded hair extension. Scalp Protective Shields: Protecting your scalp while applying hair extension on. There are 10 pieces protective shields in each pack. Professional Hair Extensions Iron C611 This Professional Hair Extensions Iron is the heating tool for applying pre-bonded hair extensions.