This is the Neu-Castle 1717, 1500kV 1/8 Brushless Motor. This brushless motor is recommended for truggy, monster truck and Muggy applications, up to 6S. Neu-Castle motors feature high quality over sized bearings, sintered Neodymium magnets, superior electromagnetic design, and rigorous engineering control in Castle's own factory resulting in a Monster motor worthy of the Castle name.