Waterproof Aluminum Foil + Slim Design: Made of waterproof aluminum foil, these slim sleeves fit easily into wallets (for men/women). Shields credit/debit cards from RFID scanning. Bright Colors for Easy Use: Slim profile adds no extra bulk to your wallet/purse. Rigid aluminum foil blocks high-tech theft. Multiple colors let you quickly find the card you need. Fits Most Cards & Passports: Waterproof sleeves—Credit Card size: 3.58” H x 2.48” W; Passport size: 5.3” H x 4.1” W. Easy to insert; works with most credit cards, bank cards, and passports. 24/7 Customer Support: We stand behind our products. Contact us anytime with questions—we’ll provide 100% satisfactory service within 24 hours. 16 RFID Blocking Sleeves Set (12 Credit Card Holders & 4 Passport Protectors) Identity Theft Protection Secure Sleeves Set, Waterproof aluminum foil slim Design