The CardiCase is a truly minimalist design. Made from a single piece of aluminum, cut into the ideal shape to positively retain as few as 1 and up to 8 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 CardiCase. The open front and back are ideal for photo ID cards like a drivers license. At only 3.46″ x 2.28″ x 0.39″, CardiCase is thinner as a cell phone and just barely larger than a credit card. Our products are CNC Machined in China from a single 7050 Aircraft-Grade Aluminum. There are no screws, hinges, snaps, magnets, straps or rubber bands to break. When you insert cards, a positive click reassuringly confirms that your cards are fully and securely inserted. At only 30 grams, CardiCase might be the lighest wallet you can buy!