Made Of PVC Material With Fused Aluminum Foil | Adheres To Back Of Your Phone With Strong Adhesive | Place Your Credit Cards In Holder To Prevent Cyber Hackers From Stealing Your Identity | Prevents Data Transfer Between The Wallet And Reader | Works With Any Contactless Chip Card. Cards That Are Swiped Do Not Send RFID Signals And Will Not Be Protected By An RFID Blocker