The 2005 United States Mint Silver Proof Set includes 11 coins in total, each of which is struck in 90% silver. The set includes the following coins: The five 2005 State Quarters, which feature designs representing California, Minnesota, Oregon, Kansas, and West Virginia. One Kennedy half-dollar. One Roosevelt dime. One Jefferson nickel. One Lincoln penny. One commemorative Jefferson nickel with a design celebrating the bicentennial of Lewis and Clark’s expedition.