The 2006 Denver 5-cent nickel is part of the United States Mint's nickel series, which has seen various designs and compositions over the years. This coin features the familiar depiction of Thomas Jefferson on the obverse, with the Monticello structure on the reverse. Collectors often seek out specific rolls from the Denver Mint for their unique mint marks and potential for grade differentiation. The nickel, composed of 75% copper and 25% nickel, is a common yet collectible item among numismatists.