What is Eris made of the dwarf planet?

Eris, a dwarf planet located in the scattered disc region of the solar system, is primarily composed of a mixture of rock and ice. Its surface is believed to be covered in a layer of frozen methane, nitrogen, and possibly other ices, giving it a bright, reflective appearance. The exact composition is still not fully understood due to its distance from Earth, but it is thought to resemble Pluto in terms of its icy and rocky materials.