The 1980 US Mint Set includes 13 uncirculated coins minted in Philadelphia and Denver. These coins have a copper alloy and copper-nickel composition, reflecting the coinage of that era. The set features coins of various denominations including 1 cent, 5 cents, 10 cents, 25 cents, and 50 cents, all struck as business coins by the U.S. Mint. This set is a valuable addition for collectors interested in United States coins from the 1980s.