The product is a collection of 22 U.S. proof sets ranging from 1974 to 2006. These sets are all uncirculated and struck in proof condition at the San Francisco Mint. Certified by the U.S. Mint, these sets are an excellent addition for collectors interested in American coins from the late 20th century. Each set contains a variety of coins in pristine proof condition, making them valuable and sought-after items for coin enthusiasts.