The RFID Blocking Sleeve is mainly used to protect the cards from external damage and extend their usage time. Can be used in many kinds of cards, such as ID cards, ATM cards, river Identification cards, and other RFID-enabled contactless Cards.Specification:Color: PinkMaterial: Aluminum, PlasticSize: 92 x 62 x 0.3mm/3.62 x 2.44 x 0.012 inch (L x W x T)Packing List: 10 Pcs x RFID Cards SleevesAdvantage:The product is made of aluminum material, good corrosion resistant, which can extend the useful life of the cardsSmall size, can easily fit in your pocket.Instruction:It is easy to use. Just put your cards in the card sleeves and the card signal would be lost when you using it.NOTE: Please check the size of your card before purchasing.