International standard EI-Lamination which is used for transformers EI CORE:Single phase size: EI-28, EI-30,EI-35,EI-38.4,EI-41, EI-48,EI-54,EI-57,EI-60,EI-66,EI-76.2, EI-85.8,EI-96,EI-100,EI-102,,EI-105,EI-114,EI-133.2,EI-152.4,EI-162 EI-168,EI-190.5,EI-228, EI-305 etc.Three phase:EI-80,EI-100,EI-160, EI-122,EI-152,EI-190,EI-250,EI-450Thickness: 0.5mm, 0.35mmMaterial: B50A600,B50A800,H-50, H-20, ...