what is RFID ? ----Radio Frequency Identification,a technology that can read datas from targets without touching.(need special equipments) What is NFC ? ----Near Field Communication,a technology that can read datas from targets without touching.(mobile phones are equipped with this) Why is not safe to our bank cards ? ----Nowadays, credit cards / passports / ID cards are all with RFID chip,which will be easily read by phones So you need our ANTI RFID CARD HOLDER. Item type: card holder Metal + plastic Size: 9.2*6.2cm Weight: about 3g color:White/Black