The New Cardprotectors Shielded Holder Protects Personal Information On Contactless Credit or Debit Cards, or Any 13.56 Mhz Rfid Technology Card Including Mifare, Iclass, Piv, Cac, Twic and Frac Cards. Insert Size 3 3/8" X 2 1/8" (86 X 54mm). Quantity of 50.