Specially engineered to block all RFID (radio-frequency identification) radio waves that can steal your personal information from credit cards. An ideal fabric to use to line the interior of wallets, purses, and more. Sew into wallets, handbags and any item you store important information in while on the go. Protect yourself from having personal and/or credit card information stolen with this RFID (radio-frequency identification) blocking fabric. Credit cards and some identification cards emit a radio-frequency when these 'tags' come in contact with radio waves emitted from a detector/reader. This fabric will block the radio waves from getting near your ID and/or credit cards and emitting information