The DM1 is a truly minimalist design - it's a single piece of titanium, cut into the ideal shape to positively retain as few as 1 and up to 4 identification or credit cards. 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 a drivers license. At only 3.53" x 2.38" x 0.23", it is thinner than an iPhone 6 and just barely larger than a credit card. Our products are CNC Machined from a single billet of solid Titanium. There are no screws, hinges, snaps, magnets, straps or rubber bands to break. At 20 grams, it might be the lighest wallet that can carry 4 cards! Ti-Black coating is a beuatiful scratch-resistant industrial hard-coating.