*For Credit Card Machines, Card Readers Magnetic Door Head ID Readers *These magnetic head cleaning cards are presaturated with a 99% IPA (alcohol) cleaning solution . *Presaturated cards instantly clean heads on credit card machines, door locks, point-of-sale credit card readers, access control/ID card readers and all open systems. Just swipe to clean. The individually packed cards are non-abrasive and incredibly easy to use * 20 Boxes containing 50 Cards / Box