1. Close flux path 2. Low magnetic leakage,low noise 3. High efficiency 4. Light weight transformer core used 0.23mm.0.27mm, 0.3mm, high-low iron loss ilicon teel magnetic quality.toroidal core used in electronic .transformer core used 0.23mm.0.27mm, 0.3mm, 0.35mm high-low iron loss silicon steel magnetic quality. toroidal core widely used in electronic equipment in the transformer, transformer, ...