The sliding frame for the forearm.
With so many parts made of different materials, I wonder how Exia would look like in just its inner frame.
Even the base for the beam saber on the shoulder armor is movable ^^
Ball joints for the base of the cape allows it to move freely - more dynamic pose for the cape
Images from Gunpla Secret Base.
Also, Bandai Hobbysite is (finally) updated with introduction thumbnails of this MG ^^
Images from Bandai Hobbysite.
