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

Proof Silver Coins Ending Soon on eBay:
1996 1oz Proof Silver Masterpieces in Silver Henry Lawson Coin

US $45.25 (0 Bid) End Date: Sunday Feb-05-2012 2:42:34 PST Bid now | Add to watch list

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