... transformer core 2.range:EFD,EF,EE,EPC,ER,PQ,RM,UU,EC,DR 3.Supply grind gap and matched bobbin ... ferrite core| soft ferrite core| transformer core| ferrite magnet coreCore material: MnZn ... Advantage: 1.We can supply the core with matched bobbin.2.Supply with the service of grind air-gap.3 ... .21.367.6268.684660260024.00 EC2834 ferrite core for transformer bobbin