The Roosevelt dime design has been in place since 1946. Modern dimes minted after 1965 are 91.67% Copper and 8.33% Nickel. The design of dimes, first coined in 1796, follow closely those of the half dimes up to the Liberty Seated type. The dimes in each instance weigh twice as much as the half dimes. The Seated Liberty dime contained 90% silver.