Chinese-made electric heads with advanced internal American specifications 18-month warranty against manufacturing defects and heat Japanese coil, 1750 RPM 60 Hz, in addition to a developed Korean Ls circuit breaker panel, 60 Hz Withstands temperatures up to 60 degrees Bearings on both upper and lower sides, immersed in thermal oil From 200 HP To 350 HP Holds the American UL certificate, insulation class C, and efficiency 95%