This is a Graupner COMPACT Series Brushless Outrunner Motor. Graupner COMPACT Series motors are built from the best materials available and are designed to provide both quality and performance at a reasonable price. Graupner COMPACT series motors used high quality aluminum alloy parts that are produced on the latest CNC milling machines to provide a beautiful, long-lasting finish. CNC Machined high performance Aluminum Can. 180C withstanding Heat-proof Coil. 200C withstanding Neodymium Sintered Magnet.