GoolRC MARSPOWER MX2204 2300KV Plus Thread Brushless Motor for RC Airplane Helicopter MARSPOWER MX2204 2300KV Mini-multicopter and Q250 Quadcopter frame kit. Long-life Japanese NMB ball bearings. Efficient Japanese Kawasaki stator steel. Oxygen free pure copper wires. Rare earth magnets stable up to 180 centigrade.