This lot includes two 1999 United States Mint Proof Set™ and two 2000 Mint Proof set, featuring uncirculated state quarter proof sets, cent, nickel, dime and half dollar. The sets contain copper/nickel composition and were struck in San Francisco by the U.S. Mint. The coins are housed in a protective lens to maintain their quality. These sets are a must-have for any coin collector or enthusiast.