The Australian two ounces silver piece (abbreviated as 2 oz and designated with Ag for "silver") is a bullion and commemorative coin format. Uniquely, in Australia there are two mints authorised to strike legal tender: the Royal Australian Mint (which also makes the country's circulating coinage) and the Perth Mint which only makes collector and bullion coins, as well as other bullion products.
Both mints endeavour to create coins with attractive designs, and to introduce new designs and themes often, in order to raise the numismatic value of the coins over the value of previous metal used.
The mint says about this coin:
"Australia’s most famous marsupial, the kangaroo has appeared on our best known coin series since 1989. Featuring superbly observed portrayals of the iconic animal, the Australian Kangaroo is beloved around the world for design, quality, purity, and an extensive array of exquisite finishes and treatments.
Fine gold gilding beautifully illuminates the background design elements on this delightful 2oz pure silver coin featuring Australia’s most symbolic animal."
The coin is "reverse gilded": the designs on both sides reveal the underlying silver, while everything else is gold plated. | 
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