Raw Materials: 1. High quality monolith of speedy silicon steel sheet 2. QZY high temperature(>180℃) resistant copper enameled wire 3. Flame-retardant and high temperature resistant lining, end cover and binding post 4. Materials meet the ROHS environmental protection requirements Advantages: 1. Small size 2. Provides long service life and super quiet 3. Low power consumption, low magnetic leakage and low raise temperature 4. Inherent overheating protection