Each is 1 oz of .999 silver. Think about the fact there are only 5000 of each in the entire world. They were minted for one year; not to be reproduced ever. Their availability will disappear.

2005 Kookaburra: These are very rare and extremely beautiful coins.  Only 5000 minted and only 2 have been graded by PCGS so this is an extremely unique find at MS67.  Not many of the 5000 have migrated to the US.  This has a population (number at this PCGS grade at time of listing) of 1!

2004 Maple Leaf:  Also extremely low mintage of 5000.  This one is MS 64 but makes a nice pair for that person born under the sign of Libra or the one seeking a gift for him/her.