Keep your info to yourself. The size of a credit card, Scanner Guard is a card that's designed to protect your personal information from would-be thieves. How? By employing built-in special metal layers that prevent radio-frequency identification (RFID) scanners from reading and stealing data from your credit cards, debit cards, or driver's license. Place up to six credit cards between two Scanner Guard cards and you'll be protected. Plus, each set includes one mirrored card for quick lipstick or dental checks. Set of two two-card Scanner Guard sets; total of four cards Blocks RFID scanners One card per set has a mirror on it Measures 3-3/8"L x 2-1/8"W Made in China