G Ore is a special type of magnetite found only in the Arctic region. It is a special material that could have been used for various applications. They were primarily used in the creation of the Metal Beasts and the Getter Robo Go.
G Ore has a thick hardness comparable to diamonds. Their magnetic properties allow conductivity as well as an ability to stay together without attachments including bones and tissue. These properties made them great for the armor of the Metal Beasts. The metal is also powerful enough to break through the atmosphere and change shapes.