The Hobbywing XRotor 2450 features a super thin disc-type structure with a low centre of gravity which guarantees better control feel, neat windings that help to produce low internal resistance and a eight-bladed centrifugal fan greatly reduces the operating temperature of the motor. Special 240? heat-resistant windings, Super thin (0.2mm) silicon sheets, quality bearings imported from Japan and N54 super magnets guarantee high torque output. HobbyWing XRotor 2450 1800KV Blue V1 Features: Super thin disc-type structure with a low centre of gravity guarantees better control feel N54 super magnets guarantee high torque output One-piece eight-bladed centrifugal fan greatly reduces the operating temperature of the motor Dedicated 4mm bearings (the thickness is enlarged by 33% comparing to the regular 3mm bearings on the market) Spec Check: Brushed/Brushless: Brushless Sensored/Sensorless: Sensorless KV Rating: 1800 LiPo Cells: 4S No-load Current(A/10V): 1.2 O.D.(mm): 30.8 Length (mm): 15.9 Length inc Shaft (mm): 29.4 Shaft Diameter (mm): 5.0 Weight (g): 35.5 (HW30405406)