... ISO14001 4. Resonable price , High quality EI lamination (silicon steel product) :1. Specifications: EI24, EI-28, EI-30 ... Materials (cold rolled grain non oriented silicon steel coils): a) Bao steel: B50A1000, B50A800, B50A600, B50A470, B35A550 ... silicon steel coils, such as Chinese steel.4. Applicable to all kinds of iron cores for power transformers and ballasts. EI lamination (silicon steel product ...