Presidential Dollars are a series of coins issued by the United States Mint, featuring portraits of U.S. presidents. The program began in 2007 and includes coins for each president, with the 2015 issue featuring the 29th president, Warren G. Harding. Each coin is made of a copper core and a manganese-brass outer layer, giving it a distinctive golden color. The obverse side displays the president's likeness, while the reverse features an image of the Statue of Liberty. These coins, especially in uncirculated or proof condition, are sought after by collectors.