RFID blocking card case or bag is created for people not only one or two RFID banks cards in hand and all need to blocking signal for another scanner to scan without any authorization ,it is made of aluminium and ABS material ,aluminium has good stopped static feature and better for protecting our bank card ,payment card to be read by another hackers .normally size will be 110*75*20mm and contain 6-8 pieces standard credit card size rfid card .Zhixin offers good quality and nice printing case for customers and contact us once you are available.