This is the standard Australian proof coin set for the year. It contains all the regular circulating denominations from $1 down to 5 cents. Instead of the definitive $2 of the "Aboriginal Elder" type though, it contains a coloured (red and black) circulating $2 commemorating the Aboriginal Flag of Australia. The coins are in Proof FDC grade.
The Royal Australian Mint says about this year's set:
"The Royal Australian Mint’s 2021 Six Coin Proof Year Set commemorates the 50th anniversary of the Australian Aboriginal Flag - a touchstone of our modern history, an official Flag of Australia and a symbol of pride and unity for our First Nations People.
The set includes a collector version of the coloured two dollar coin produced for circulation to commemorate the anniversary. Harold Thomas’ iconic Australian Aboriginal Flag design is strikingly represented on the coin with the black and red fields printed over a relief pattern of miniature flags. The centre of the coin has been left print-free allowing the gold of the coin’s alloy to shine through as a unique representation of the central yellow sun motif." | 
Search for this coin set on eBay 