I guess they tell you in the description what thickness of metal you can use them on. I only thought it worth mentioning again because the detail on these matrices is lost on heavy metal. I only know this because I use a 30 gauge piece to check my stamps when I'm stamping to make sure I'm picking the right one. (Hey, YOU are my age trying to read a 2mm postage stamp.) Ha. However, for the most part they are larger and easily distinguishable. The only problem I've had with these small, flimsy stamps is that it's very easy to get only half the print,
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