The 2018-S US Mint Silver Proof Set includes 10 uncirculated silver coins with a fineness of 90% silver. This proof set, minted in San Francisco by the U. Mint, comes in its original government packaging with a Certificate of Authenticity. Each coin is struck to a proof finish, making them highly sought after by collectors. This set is a valuable addition to any coin collection, showcasing the quality and craftsmanship of American coinage.