It was introduced in Generation II, along with the Dark type, to balance the other types. It was added to the typing of two Pokémon, Magnemite and Magneton, which were only Electric-type. Steel-type Pokémon stand out for having great defense against both physical and special attacks, and a large number of resistances. They tend to be heavy and thus have low Speed. Steel-types are mainly inorganic in nature, some of them representing robots and machines. Along with the Rock and Ground types, Steel represents part of the Earth's minerals as types.