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

Proof Silver Coins Ending Soon on eBay:
1994-P AMERICAN SILVER EAGLE DOLLAR PROOF w BOX COIN !!

US $127.12 (0 Bid) End Date: Monday May-21-2012 17:51:52 PDT Bid now | Add to watch list

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