The 2007 US Mint Silver Proof Set includes 14 pieces of silver coins with a total weight of 1.34 troy oz. These coins have a denomination ranging from 1 to 50 cents and are all composed of silver with a fineness of 0.9. Minted in San Francisco, the set comes with a box and a Certificate of Authenticity from the U. Featuring various denominations and a striking proof finish, this set is a valuable addition to any coin collection for collectors interested in US coins.