As well as similiar products: RFID blocker sleeve, RFID CREDIT CARD Sleeve, RFID Passport sleeve, Envelope and RFID blocking cover as customer request (printing and size can be custmized)

How does the rfid card and passport blocking sleeve work?

These rfid card and passport blocking sleeve are designed to shield RFID signals. Secure sleeves create an RFID shield by blocking the electromagnetic energy necessary to power and communicate with contactless smart cards. So illegal RFID credit card readers can't access to the information stored in your credit card protector chips.

What's the Functions of  RFID card and passport blocking sleeve?

Protect your cards from EMI(Electro Magnetic Interference)
Protect your contactless IC cards information from being stolen, including Identity Card, Credit Card, Employee's Card
Protect your contactless IC cards chips from damage
Protect your magnetic card from EMI damage, which would caused information lost. (This happens a lot if you put your magcard near your cellphone too often)
Protect your cards from scratch

What's the application for the RFID card and passport blocking sleeve? 

RFID card and passport blocking sleeve printing on foil side - can be used for credit cards, debit cards and ATM cards with embedded RFID technology and many other similar-sized cards like building access cards, company ID cards, school ID cards, driver's licenses, transit cards and other RFID-enabled smart cards