The 2009 United States Mint Silver Proof 18 coin Set contains a collection of 18 uncirculated silver coins, each struck with a proof finish at the San Francisco Mint. This set includes a variety of coins with a silver composition of 90%, making it a valuable addition to any coin collector's portfolio. Certified by the U.S. Mint, these coins bear the mark of authenticity and quality, showcasing the craftsmanship of American minting.