ZAOZHUANG YIYUAN ELECTRONIC TECHNOLOGY CO., LTD IS SPECIALIZING IN R&D, PRODUCTION OF FERRITE CORE WITH ANNUAL CAPACITY OF 6000 TONS FOR OVER 40 YEARS OLD. THERE ARE MORE THAN 600 TYPES OF CORES COVERING EE (FROM EE10 TO EE70) EFD(FROM EFD15 TO EFD40) PQ(FROM PQ20 TO PQ65) , EP ,EPC ,POT, ETD , ED, ATQ RM , RING CORES AND SO ON MADE OF EP40 ,EP44 EP90,EP95 EP96 EP97 .