... market;11.Bobbin Usefulness :be used for Transformer,inductor and Other electronic products.12.we can assure ... in the linear filter ,current tranformer,smoothing choke coil,drive transformer•RM core core: filters, inductors and ... and transformers•DRUM core:Choke coils, Peaking coils, Linearity coils, Alarm coils, Power choke coils, Fixed choke coils, Filtering coils, Conformal coater inductors, ...