Many credit and debit cards and enhanced drivers licenses have a Radio Frequency Identification Chip Protect your data and prevent hackers from getting your personal info. Hackers can scan up to 70 ft. Product material: Inside: Polyethylene. Outside: Polyethylene Terephthalate Product designed to fit card snugly. Will stretch over time with use. Made for one card. Please note: Item does not have adhesive backing and cannot be attached to back of phone.