Enroute RFID Blocking Silver Sleeves Covers Passport Credit Cards, Silver Set of 2 sleeves ; 1 large 5 3/8 x 4 1/8; 2 small 2 3/4 x 3 1/2 Large sleeve holds and protects passport Smaller sleeves hold and protect credit cards Silver Sleeves material blocks unauthorized scanning and protects privacy Protect credit card strip from demagnetizing