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Both the inner and outer cores are composed of iron and nickel, with trace amounts of lighter elements, and together, they add to a radius that is as large as Mars itself.
Current models of Mars’ interior suggest that its core region is roughly 1,794 ± 65 kilometers (1,115 ± 40 mi) in radius, and is composed primarily of iron and nickel with about 16-17% sulfur.
Radar data and soil samples have confirmed the presence of shallow subsurface water at the middle latitudes as well.
Both planets have a silicate mantle surrounding their cores and a surface crust of solid material.