The 2005-S United States US Mint 50 State Quarters Proof Set includes uncirculated 25 cent coins from the states of California, Minnesota, Oregon, Kansas, and West Virginia. Minted in San Francisco by the US Mint, these coins are struck in proof condition, making them highly desirable for collectors. Each coin is certified by the U.S. Mint and bears a unique KM number. This set is a valuable addition to any coin collection, showcasing the diversity and beauty of the United States states through coinage.