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A comment on Spraying Magnetic Stripe Cards with Iron Filings. Parent comment

Re:Spraying Magnetic Stripe Cards with Iron Filings by quadrature on Tuesday July 21, 2015 @04:21PM (#9925481)
Far more likely that someone had some bulk tags or defect tags and found a way to spin them into another product.
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Re:Spraying Magnetic Stripe Cards with Iron Filings by leni536 on Tuesday July 21, 2015 @05:27PM (#9925940)
According to Amazon this product's dimensions are 1.1x2.1 in. ISO/IEC 7810 cards (your average card with a magnetic stripe) is 3.370 × 2.125 in. I would bet that they get thrown out/ defect cards (probably not bank cards), clean and reprint the surface and cut them into three pieces.
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