. Product Description. Anti-Theft RFID Shield Credit Card Protector smart RFID Blocking card. RFID chips are growing in popularity as the technology spreads across multiple industries. For consumers, this technology is embedded in credit cards, identification cards, passports and more. This is great for convenience.RFID Blocking Card Protector. Features: In order to prevent criminals from stealing your card information, just put the RFID card and your smart card together, your card information will be isolated and cannot be stolen. 1: ISO CR80 size of custom sizes, shapes and other material if needed. 2: PET, PVC, Paper ,ABS, etc material for choose.Credit Card Sleeves, I3C Anti Theft Credit Card RFID Blocking Sleeves Protector Passport Holder Sleeves 5 Credit Card Sleeves, 1 Passport Sleeves 4.5 out of 5 stars 1,007 $9.99 $ 9 . 993- How many credit cards can be protected with one blocking cards . Our RFID Blocking cards protect field is 720°, 3D protection. This fieild is about 2-5cm for normal. So if cards are placed together, blocking cards can protect about 5-10pcs. cards. (The working type of RFID Blocking cards is same as RFID products. It is Passive.