Royal Mint test coins

Just bought this item at auction because who can pass up a bargain, right? The three test coin set comes from the Royal Mint but I can't find anything on them. They are Copper, Nickel and Brass. Any idea of what denomination they were testing? Any info would be appreciated. Thank you!!
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Year? Did you text the royal mint?
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No year. I learned a little about ArMour but that's it.
Nevermind. I found it. These are demo coins used the show the Royal Mints plating process used to manufacture longer lasting coins. Off to eBay it goes!
https://www.royalmint.com/corporate/circulating-coin/nickel-plated-steel/