Some aluminium wires are soft and some are tough. Why?
Good aluminum should be less impurities, relatively soft, aluminum impurities, impurities, the texture is relatively hard.
In addition, the aluminum wire has a single core aluminum and multi-core aluminum wire, single core and multi-core aluminum wire compared with copper wire in the soft and hard line, multi-core called flexible cord, single core is called hard wire.
If all are single core of aluminum, there are soft and hard points, and that is the material problems
