The 1999 US Mint 50 State Silver Proof Set includes a collection of 5 of 50 states covered in this commemorative series. Along with a penny, nickel, dime, 50c piece and a Liberty dollar of the same year. Made of 90% silver. Each coin is struck in proof quality at the San Francisco Mint and comes with a Certificate of Authenticity. The set comes with a box for safekeeping and is a valuable addition to any coin collection.