Silicon-iron alloys used mainly in the manufacture
motors, generators, transformers, and tube-light ballasts due to their magnetic properties, these steels are supplied commonly in two millimeter
thick cold-rolled strips
. One type (called 'grain oriented') has magnetic properties only in the direction of rolling
, the other (called 'non-grain oriented') has those properties in the across-the-width (transverse) direction as well. Also called silicon electrical steels.