The United States began an ambitious program in 2007 to honor each American President, beginning with George Washington, on a separate $1 coin; the Presidential $1 coin program issues four new coins per year. They are minted especially for collectors since they are not popular for regular circulation needs.
The coins are made of a mixture, including copper, zinc, manganese, and nickel, that gives them a golden color, but they do not contain any gold. They share this quality with Sacagawea dollars, which are also being minted alongside the Presidentials.
Completing the set is fun for many collectors, and other buyers may look for special high-quality proofs and other rare and especially collectible examples of Presidential $1 coins.