What is Mars' moons made of?

Answer 1

They are made of the same material as asteroids and meteorites, namely water, silicates, oxides, sulfides, and a few other minerals.

Answer 2

Mars has two small moons called Phobos and Deimos. They are believed to be made primarily of carbon-rich rock material. Both moons are irregularly shaped and are thought to be captured asteroids from the asteroid belt.