... match bobbins 1.Core material: MN-ZN Soft magnetism Ferrite core2.Core cost: not expensive3.Core range :EE, EEL, EI,EC,EF,EFD,ETD,EPC,PQ ... ,RM,UU.4.Can be supplied with their match bobbins 5.Core Usefulness :be used for Transformer,inductor ...