... or, rather, two moons.
Pluto and Charon as seen by the Hubble Space Telescope.
Pluto's mass is only 0.002 Earth masses and its radius is about 0.2 RE, or abut 2/3 the radius of the earth's moon. This gives it a density of about 2000 kg/m3, suggesting that it is made of ice and rock.
Its moon, Charon, has a radius about half that of Pluto.