After having made some rfid wallets myself, I must say, this item blocks rfid just as well or better than home made products, and is a lot less work.  Husband tested it at his place of business (which requires rfid id), and it works just fine.  The documentation *does* say that wallet should be replaced periodically (sounds like mylar or maybe crinkly aluminum foil inside,) but so does any wallet you make yourself.  Any metal fatigues and breaks eventually (along the crack where the wallet folds,) and needs to be replaced.  And this is cheap enough that replacing it every six months to a year should not be a problem.