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I have a LOT of rfid tags? What are they made of and can they be sold or recycled? These are the flat type that go in books.

Doubtful if anything that may be economically salvageable. If you want, you could send me a few and I can look at them. With hundred of types of RFID tags being used, there is always a possibility that some of yours could be of some value.

Are you refering to EAS tags, the magnetic strips found in a lot of library books?

These things are incredibly cheap new, otherwise businesses and libraries couldn't afford to put them all over every single book or small unit of merchandise.

Light iron/shred scrap would be my approach.

These are not the ones that just set off a beeper they are the real smart ones. that id the book.