1.Bobbin material:bakelite 2.core material: Soft magnetism Ferrite core 3.The connection can be stipulated by customer. Our company Guangzhou Tongyang Electronics Co., Ltd. is specialized in producing various specifications of transformer ,power transformer,high-frequency transformer,like RM,PQ,POT,EE,EF,ET,ETD,RING ,and etc . EF TYPE: Our products, manufactured using imported components, ...