Ring magnetic ring core is refers to by various iron oxide mixture composition of a sintering magnetic metal oxide. for example, manganese-zinc ferrite and nickel-zinc ferrite is typical of core body material. manganese-zinc ferrite has high permeability and high magnetic pass density of features, and in below 1MHz of frequency Shi, has lower loss of characteristics. nickel-zinc ferrite has very high of impedance rate, and not to hundreds of of low permeability, characteristics, And at higher 1MHz of producing low frequency loss. ring-shaped magnetic ring magnetic core coils and transformers for all kinds of electronic devices.