Dhani Sutanto took an Oyster Card, a form of electronic ticketing used on public transport based in Greater London in England, and after stripping out the RFID chip and antenna, made a resin ring out of it.
A personal project to do a bit of fun and research on wearable and fashionable digital devices or RFID chips.
Oyster card is a property of TFL.
I'm not encouraging you to do the same because I'm pretty sure it's illegal to do so.
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