Passport RFID Sleeves (4) Choose your quantity - 2,4 or 10 Passport sleeves, or 16 Credit card or a Combo! Passport size - 5 1/4 x 4 1/4 inches, Credit card size 3 3/4 x 2 1/2 inches SAFETY PRIVACY SECURITY - The sleeves equipped with advanced RFID SECURE Technology, a unique metal composite, engineered specifically to block 13.56 MHz or higher RFID signals and protect the valuable information stored on RFID chips from unauthorized scans. PREMIUM QUALITY - Made from durable, tough materials resistant to tears and punctures - perfect for traveling or everyday use.