The 2005 US Mint 50 State Quarters Silver Proof Set includes uncirculated coins with a composition of 90% silver. This set, minted in San Francisco, features coins with a denomination of 25 cents each in proof condition. Each set comes with a Certificate of Authenticity from the U.S. Mint and includes the original government packaging. Perfect for collectors interested in United States coins, this set offers a valuable addition to any numismatic collection.