The 2025 S Mint Proof Set includes 10 proof coins with a fineness of 0.999, struck in San Francisco with original mint packaging. This set is certified by the U. Mint and contains coins from the United States. Each coin is uncirculated and in pristine condition, making them highly sought after by collectors for their proof quality and limited availability. The set is a valuable addition to any coin collection, showcasing the craftsmanship and precision of modern American coinage.