Chinese-made electric heads with advanced American internal specifications. 24 months warranty against manufacturing defects and heat. Japanese coil, 1750 RPM. 60 Hz, in addition to a developed Korean Ls 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 American UL certification, insulation class C, and 95% efficiency.