RFID Blocking Wallet: Tested for 13.56 MHz Frequency in which the credit cards operate.125 kHz Proximity Cards, RFID signals are NOT blocked. We Made This One Ourselves: After testing the competition we knew we had to develop our Money Clip; Finding the right factory wasn’t easy but once the prototype was completed we knew we had a winner using Full Grain Napa Cow Leather, detailed stitching, and secure card slot holders.