Anti-Hacking Jammer: The protector has a secure anti-radiation shield that blocks harmful signals. Suitable for frequencies up to 13.56 MHz. Lined with an electromagnetically opaque shield to block wave signals from high-tech pickpockets and unauthorized electronic scanning devices. Premium Quality Protection: The high-quality advanced aluminum composite material is strong, super slim, lightweight, and tear-resistant. Take it EVERYWHERE: Our cards are slim and fit perfectly in cardholders, wallets, and even the back pockets of your jeans! Practical Information: A set of cases is suitable for all types of cards, e.g., bank, credit, debit cards, ATM cards, health insurance, Visa, Mastercard, membership cards, loyalty cards, etc. Best Gifts: Give this card to your family and best friends. It is a safe and reliable way to protect their credit cards or passports, by giving them this small gift.