Protect against identity theft with a card sleeve that blocks radio frequency identification (RFID). Secure personal credit, debit and business ID card information by shielding from unauthorized and unknown access. Smart Card RFID-blocking Sleeve includes water-vapor barrier for long life. Horizontal design fits easily in wallets. Maximum insert size is 3-3/8″ wide x 2-1/8″ high (86mm x 54mm).