DOES NOT BLOCK RFID TAGS! DO NOT BUY! I would like to know who "certified" this and what this processing consisted of, apart from simply writing that it was certified. Every day I use an RFID card to enter the office I work in, and my old, plain, one-piece, curved metal money clip that hasn't been "certified" is better at blocking RFID tags than this one. Really, just save your money and wrap your RFID card in paper. This is a much more advanced RFID tag blocking technology compared to this money clip.