Features:1.Protect magnetism, secure your card information, prevent card bending and abrasion2.These sleeves provide a security barrier that prevents employees from accessing the RFID signal from your bank cards, etc.3.The anti-degaussing card bag (kit) is made of special high-performance electromagnetic shielding material.4. By placing a magnetic card or ID card in the bag, you will prevent various magnetic cards from being demagnetized by a mobile phone or other electromagnetic waves. The ID card is thus kept safe and personal information cannot be stolen.5.Suitable for: protecting smart transportation cards, IC credit cards, IC debit cards, IC access cards, bus cards, bank cards, bank passbooks, social security cards, health insurance cards, shopping cards, second-generation ID cards and other magnetic cardsMain functions:1. Prevent strong static interference2, prevent the destruction of strong electromagnetic fields3. Prevent others from maliciously stealing and stealing your personal information.4. Extend the effective lifespan of the smart cardSpecification:-Material: Aluminum + Plastic-Color: As shown-Size: 9.2*6.2cm-Package includes: 20 x RFID blocking security sleeves