1974 Kennedy Half Dollar Miniature Size?

Hello everyone. Are any of you familiar with this type of "Aspirin Sized" Kennedy Half Dollar coin & if so can you please educate me with a brief history lesson? I'd kindly appreciate it. I've been unable to find anything about them online nor my literature.
Again, any info provided will be greatly appreciated. Thank you
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Comments
Not a coin. It's a souvenir. They were made in huge numbers and marketed as "shrinking currency" to represent the affect of inflation. They come in all denominations.
All comments reflect the opinion of the author, evn when irrefutably accurate.
In addition to @jmlanzaf post they are sometimes used for magic tricks.
Maybe novelty
+1,000.
Not a numismatic item.
I have seen sets of all six denominations stapled into a dollar 2x2.
Not to be confused with coins shrunk in diameter (but increased in thickness) using electromagnetism.
http://www.capturedlightning.com/frames/shrinkergallery.html
https://forums.collectors.com/discussion/962678/can-anyone-explain-this-magnetic-force
I have some of those electro shrunk coins (ASE's)....kinda cool. Same weight but more compact
I have read about the electro-shrunken coins, but never actually seen one 'in hand'....The OP coin is a novelty coin...Cheers, RickO