The 2010 US Mint $1 Dollar 4 Coin Proof Set from San Francisco features uncirculated coins struck with a brass clad copper composition. This set includes coins of President James Buchanan, Abraham Lincoln, Franklin Pierce, and Millard Fillmore. Certified by the U.S. Mint, this set is a collector's item showcasing the presidential series of coins issued by the United States government. Each coin is graded ungraded and comes in its original packaging, making it a pristine addition to any coin collection.