There are only 500 sets available worldwide and they have been sold out at the Royal Mint.
The specifications:
Alloy: .999 silver
Diameter: 38.61mm
Weight: 31.21g
Quality: proof & frosted proof
Presentation: the Royal Mint original box complete with a certificate of authenticity
We have a few of them in stock, therefore, the number on the certificate might be different from the one shown in the picture.