... .Repeatable properties High Permeability MnZn or NiZn Ferrite FT & ET CoreGeneral Introduction 1, NiZn ferrite core is one kind of ... appliance, computer etc area. Features: 1, FT cores and ET cores possess characters of ferrites, which exhibit high permeability and ... high resistivity. 2, Also FT cores and ET cores are also reasonably stable (repeatable properties) over time ...