China ShenZhen TongDing Electronic Co., Ltd., (HongKong TongDing Electronic Co., Ltd.) is an ISO-9001, ISO-14001, QC-080000 certified manufacturer of Manganese-Zinc & Nickel-Zinc ferrite products in ShenZhen. Established in 2005, we have built a reputation as a major and reliable supplier to ferrite users worldwide. Our complete dedication in research and development and manufacturing excellence has enabled us to offer a wide range of high quality, standard and custom-made Mn- Zn & Ni-Zn ferrite products in different materials to our customers.