Their separator discs then ensure that only the grain is placed into three immense hoppers that make up the bulk of the Mega-harvesters' rears. Each hopper is capable of holding five hundred tons of grain and any non-grain material collected, is expelled through the Mega-harvesters' rear ejectors. This is done with enough force, that anyone standing behind the vehicles can be seriously injured by the impact. The Mega-harvesters can be manually steered within the vehicles' control cabins or they can be set upon pre-determined routes. They are also armed with harpoon launchers and crude Rotary Cannons, to ward off attacks.