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Features: Aluminum ferrules can avoid bank card, the second generation ID card, information card, social security card and other magnetic disappear or information leakage.There is also a strong waterproof protection for your card. Multiple tests show these sleeves block high and low frequencies commonly used in RFID Scanning devices. The coated sleeves with a metallic interior RFID Blocking material are made to last the test of time. This is only an auxiliary product, to reduce magnetic weakness between the cards. Buy confident with our free return policy if you are not 100% satisfied in the first thirty days of purchase.No questions asked. Specifications: Size:9.1cm x 6.3cm x 0.02cm Material:Metal Shielding Aluminum Color:Silver Package Includes: 10Pcs Blocking Credit Card Sleeve Protector Shield