Good way to label these keytags permanently

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i have bought 100 new plastic keytags to replace existing ones, they are RFID ones.
i cant think of a way to label these things.
i need to have 3 digits on them in reasonably large writing that will not easily come off so need to withstand a fair bit.
what ways can you think of to do this??

http://www.renovateforum.com/attachments/f85/93301d1351210373t-good-way-label-these-keytags-permanently-keytags.jpg (http://www.renovateforum.com/attachments/f85/93301d1351210373-good-way-label-these-keytags-permanently-keytags.jpg)
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