Magnetic closure. YOU WORK HARD FOR YOUR MONEY: That’s why we use 4 Rare Earth Magnets (instead of 2) to hold on to your cash. We tested the rest and now you can buy the best. Rare-Earth magnets were developed in the ’70s and are made from alloys of rare earth elements. They are the strongest type of permanent magnets. 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. SIZE and FEATURES: The wallet is 4”x 3” and fits nicely in your front pocket. Comes with 3 card slots, 2 larger slots, and an I.D. holder. RFID Blocking Wallet: Tested for 13.56 MHz Frequency in which the credit cards operate.125 kHz Proximity Cards, RFID signals are NOT blocked.