The coins are .999 finesilver. While the obverse of the coin always depicts Queen Elizabeth II, the reverse side changes every year, always featuring a kookaburra, a bird native to Australia.
Due to the yearly design change and limited production of the one ounce coins, they have higher collectible value than some other bullion coins. The Perth Mint generally ships the coins in individual plastic capsules.
Special editions such as proof, high relief, privy marked, colored, and gilded are often available. They are minted in the following four sizes: To commemorate the 25th anniversary of the kookaburra coin, the 2015 coin will feature the same image of the kookaburra as the original 1990 coin.
To differentiate the 1990 and 2015 coins the date on the reverse reads 1990-2015 and 2015 has been added to the obverse. The 2015 coin has a release date of September 1, 2014.