... EI-24 to EI240 3. ISO9001, ISO14001 4. Resonable price , High quality EI lamination (silicon steel product) :1. Specifications: EI24, EI-28, EI-30, EI-35, EI ... -41, EI-41-2H, EI-48, EI-48-2H, EI-54,EI-57, EI-57-2H / 4H, EI ... of iron cores for power transformers and ballasts. EI lamination (silicon steel product)