Tyvek Credit Card Protector Wallet - RFID Blocking Wallet Dimensions: Width: 4", Height: 3", Thickness: .01" Security. Fiber paper-like wallet contains a specialized metal composite which blocks RFID signals, protecting your personal information from unauthorized scans. Minimal Bulk. Super-thin fiber material is as thin as it is strong. Compact. Fold over and store for ultimate space saving. Quality. Resilient, tear and water resistant material (compare to Tyvek Mighty Wallet) is designed to endure daily usage and travel.