<human>:  Is nickel dominant material in US 2020 nickels?
<bot>: No, nickel is not the dominant material in US 2020 nickels. Nickels have been made of various materials including silver in the 1940s. Nickels in 2020 are made from a mix of copper and nickel. 2020 nickels are 25% nickel and 75% copper. So copper is the dominant material in US 2020 nickels.