The aluminum Cardprotector protects your cards against bending, breaking and unauthorized wireless RFID / NFC communication.
Most cards nowadays contain a chip and antenna for wireless communication. These RFID / NFC cards are convenient but there is a risk involved - they can be read, activated and cloned from a metre away.
The Carprotector inside each Secrid wallet protects your cards from these kind of unwanted incidents. By revealing only a part of the cards, the signal is reduced but still sufficient for the use. Your cards will be protected not only when put away, but also when you use them.