It is made of concrete and rebar with traces of Krylon brand spray paint. SCP-173 is extremely hostile and animate. It cannot move while viewed directly and must not be broken. It is reported to kill its victims by snapping the neck of any human it encounters. It can only move when your not looking at it. He only kills people because it just wants to be looked at. He doesn't like it when someone looks away. He just wants someone to look at him, forever, he just wants that happiness.