Have you read the geekhack TOS lately?
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Laser etched PBT will last a good long while before wear starts to show, so I think they'll do what you want. If the set you're referring to is the 111 key set like this: https://www.teraset.net/product_details.php?p=9332#.U-iriWOEyHsthen it's thick PBT. Very nice keycaps.