This is Hobbywing EZRUN 4985SL 1650KV Sensorless Brushless Motor For Traxxas XO-1 E-REVO 1/6 1/7 RC. With a fast acceleration response and a rock-solid, stable output, the EZRUN 4985 motor can handle instant full-torque start-ups for wheelies, high-speed racing on straightaways and powering through the bumpiest terrain. When pairing the EZRUN 4985 motor with the Hobbywing upgraded MAX6 ESC, the built-in temperature sensor & port will e?ectively prevent the motor from being damaged due to overheat and prolong its service life. Hobbywing’s temperature control technology has been designed to protect the motor from being damaged by heat thus less heat more e?cient the motor will run and perform. The output performance of this motor has an e?ciency rate of up to 90% (an industry-leading level). When pairing the EZRUN 4985 motor with the Hobbywing EZRUN MAX6 ESC, the excellent match between ESC and motor will give you large torque plus a very smooth and linear power band. The use of CNC-machined hard anodized aluminum case, ultra-thin silicon steel laminations, heat-resistant oxygen-free double insulated windings, high quality Japanese bearings, rotor with a strong structure and output shaft made from high quality polished alloy steel guarantees outstanding performance and super durability.