HEllo! The copy machine cards used in copy machines at schools/universities - blank on one side and a magnet stripe (sized 1/3 of a credit card stripe) on the other side, very thin cards , fully bendable as paper. You put the card inside the box attached to the copymachine and your value in the card is displayed. So i know you can copy a credit card with a reader/writer , how to hack this type of cards ? To add more value to it for free copying? I use the copy machine alot. copy whole books, so save a lot of money. Ok. got some photos. http://i124.photobucket.com/albums/p31/baso_/DSC00014.jpg 1: Is a access card same size and type as a bank/credit card.I have just showed it here for comparing with the copy machine crads. 2:The card is a copy card from a library, you buy with a value.ex.10 copies. 3:Is a copy card from the university, you buy it with a value, example 10 copies. The reader on both university and the library copy machine is sized as a portable harddrive for pc.you put the card in and it has a display which shows the value of it. Card 1: http://i124.photobucket.com/albums/p31/baso_/DSC00018.jpg As you can see it is hard to bend, its made of plastic.Same as credit card. Visa/Mastercard etc. Card 2: http://i124.photobucket.com/albums/p31/baso_/DSC00020.jpg As you can see its not the same type its made thick paper, and the magnet stripe on this looks like its printed with ink if you look closely on it. hard to see in the picture. Card 3 is of same type but you can see that the stripe is not ink but glued on as magnetic stripe. http://i124.photobucket.com/albums/p31/baso_/DSC00028.jpg I know you can use a writer like these on card 1: http://search.ebay.com/search/search.dll?f...c+stripe+writer But you need so expensive witer on the copy machine cards? Or can you do something with the card so when you put it in the machine it only reads and cant write to it so it dont change value? Something that work like some liquid or tape on it?