Roosevelt DimeSilver Composition (1946-1964)Designer – Engraver: John R SinnockMetal Composition: 90% Silver – 10% CopperDiameter: 17.9 mm Mass / Weight: 2.5 gramsClad Composition (1965-Present)Designer – Engraver: John R Sinnock Metal Composition: 91.67% Copper – 8.33% NickelDiameter: 17.9 mm Mass / Weight: 2.27 grams