In the 2007 United States Mint Silver Proof Set are the four Presidential coins also 90% silver?

Proof Silver Coins Ending Soon on eBay:
China 60th Anniversary of Peaceful Liberation Tibet 10Yuan 1oz Silver Proof Coin

US $230.00 End Date: Tuesday Feb-07-2012 7:15:57 PST Buy It Now for only: US $230.00 Buy it now | Add to watch list

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