Mainly ferrite, a key material used in electronic and magnetic products. TDK's main products include ceramic capacitors, aluminum electrolytic capacitors, film capacitors, ferrites and inductors, high-frequency components, piezoelectric and protection devices, as well as various passive components and power supply devices such as sensors and sensor systems. Product brands include TDK, EPCOS, InvenSense, Micronas, Tronics and TDK-Lambda. In addition, TDK also provides magnetic application products such as magnets, energy devices, and flash memory application equipment.