These Holographic Vertical RFID Blocking Card Sleeves keep all your 13.56MHz RFID-enabled cards (i.e. credit cards, bank cards, photo IDs, etc) safe from identity theft and are much more effective than wrapping them in aluminum foil. These protect your cards' Radio Frequency Identification (RFID) chip from getting accessed by an uninvited, unauthorized, potentially nefarious RFID reader.