Sister Friends - RFID signal blocking credit card holder. RFID (radio frequency) blocking wallets are designed to help insulate you from a very particular brand of electronic pick-pocketing, called RFID skimming. This high-quality RFID signal blocker credit card case features African American artwork and inspirational phrases. It's constructed with an aluminum shell and coated in a durable thick ABS plastic, perfect for storing credit cards, IDs and business cards. Portable and lightweight, it's ideal for when you're on the go and easily fit in your pocket or purse.