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

Proof Silver Coins Ending Soon on eBay:
5 Dollars 1989 Marshall Islands Proof World Coin Man on Moon Silver Dollar Size

US $9.99 End Date: Monday May-21-2012 16:48:36 PDT Buy It Now for only: US $9.99 Buy it now | Add to watch list

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