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Where can I buy an anti-interference magnetic ring offline?

The anti-interference magnetic ring is sold by Dongguan Canfeng Electronics Co., Ltd. Guanshi Canfeng Electronics Co., Ltd. is an enterprise with many years' experience in producing magnetic cores, with comprehensive scientific and intelligent management system, advanced automatic molding machine, NGK sintering furnace, Jinri grinding machine and advanced magnetic material testing instruments. Through close cooperation with many scientific research units, Guanshi Canfeng Electronics Co., Ltd. recruits talents, develops new products and improves product quality.