The Peek-a-Bye credit card protector sleeve guards your card number from prying eyes. The plastic sleeve does not cover the magnetic strip and is slim enough to still allow your credit card to work in standard card readers. There is a plastic window on the rear side to show your signature. Will the nearly $3 each Peek-A-Bye prevent identity theft? I honestly don’t think it will do much besides give the owner a false sense of security and some company a unique promotional branding opportunity right on your credit card.