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

Proof Silver Coins Ending Soon on eBay:
INCREDIBLE 1 US COIN COLLECTION! LOT~SILVER~GOLD~MORE! V5 PROOF MINT ESTATE SALE

US $300.00 (21 Bids) End Date: Friday May-18-2012 15:37:45 PDT Bid now | Add to watch list

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