Custom Business Card Holders, Donald RFID Smartphone Card Holder - Adhesive Back, When you grab your phone, the convenience of the Donald card holder ensures that your important cards are always close at hand. Free yourself from holding a bag or carrying that heavy wallet and simply use the card holder's adhesive back to securely attach it to the back of your phone. Safely tuck your credit and bank cards into the 2 pockets and the built-in RFID technology will protect your personal information. ... #ST149 $8.43/each.