The Mint says about the set:
"Celebrating Australia’s remarkable dinosaur history is this captivating silver proof coin set featuring four dinosaur species known to have roamed Australia. You may recognise Diamantinasaurus matildae, which was a whopping 16 to 20 metres long, or maybe the Kunbarrasaurus ieversi, which was covered in bony armour. Skeletons of both these species have been found in Queensland, along with the carnivorous and frightening-looking Australovenator wintonensis. Completing the collection is an elaphrosaurine theropod, which was discovered in Victoria and thought to enjoy a plant-based diet. This set is one of just 1,000 and the coins’ composition is 99.9 per cent silver. Cast your mind back millions of years to when these impressive creatures roamed Australia when you add this special set to your collection."
The four dinosaur coins in the set are silver proof versions of the circulating commemoratives released into circulation through Australia Post on 5 September 2022.