The 1978-S US Mint Proof Set includes 6 uncirculated coins ranging in denomination from 1 cent to $1, all made of copper. These coins are struck in proof quality at the San Francisco Mint and come in their original government packaging. Each coin is certified by the U.S. Mint, making it a valuable addition to any coin collection. This set is a perfect representation of American currency from the late 1970s, showcasing the craftsmanship and quality of U.S. coins.