Genuine Audi Stainless Steel Passport Case with RFID Blocking Technology Brand New Genuine Audi Passport Case with RFID Blocking Technology You can never be too careful, especially while travelling abroad. That's why this passport case blocks unauthorized transmission from RFID enabled credit cards and IDs. It's also beautifully made using 85%+ post consumer recycled stainless steel. Materials: woven stainless steel fabric, black nylon and red textured rubber. Dimensions: 4" w x 5.94" h x .19" d. Audi rings logo.