The perfect additional security layer to your Billfodl, these stickers are single-stick, perforated and individually numbered so you will know if someone has opened your Billfodl and exposed your private keys. Simply remove the sticker from the paper and place several over the sides of the Billfodl. Should someone try to open the Billfodl, it will be obvious to you, as the stickers are designed to break into pieces when tampered with.