The DM1 is truly minimalist design - it's single piece of titanium, cut into the ideal shape to positively retain cards. It is available in 3-sizes: 4-card, 8-card and 12-card. The design eliminates any unnecessary parts, but securely and beautifully carries and protects your cards. It does NOT block RFID - so you can use building access cards and contact-less RFID credit cards without removing them from the DM1. The open front and back are ideal for photo ID cards like drivers license. At only 3. x 2. , it is barely larger than your stack of credit cards. Our products are CNC Machined from single billet of solid Titanium. There are no screws, hinges, snaps, magnets, straps or rubber bands to break.