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Hello all, Apologize for fancy title, but it is not that much complex. I am armature in leather crafts and learning from this great community. Now on topic, recently I made design for one zip wallet. where it has one side, 3 slots for cards. And just in-front of cards, I have to placed 25x2 mm round magnet for some other purpose. For reference, I have attached design. Now as you can see in photo, Black round is magnet (which I can hide by placing yellow square leather on it). Now above that magnet has 3 slots for cards, and slots continues behind magnet (shown as sky blue card). Now my concern is, magnet can easily destroy atm cards' black magnetic tape (demagnetized and erase info on cards). So I have to put something in-between magnet and cards to protect atm cards. There are ferromagnetic metals that can shield magnetic field for some extend. But they all are metal and cant be sew. I did some research on magnet and came to know that, either I put some ferromagnetic metal sheet inbetween or atleast 3-5mm thick material that would be enough to protect cards. 3-5 mm materials would be make wallet more thick and I am looking for another thin option. Anybody came across this type of situation? and what can be remedy for this. Or anybody know any thin material that can shield magnetic wave good enough and can easily put in linings. Thanks in advance.