Feature: 1. Built In Fan: Unique built in fan blade to reduce internal heat loss. 2.0mm back cover with carbon plate welded with gold‑plated copper column for perfect wiring. 2. High Power: Full slot full rate resistance value with very low internal resistance to obtain high power output. The rotor is double wrapped with yellow imported bulletproof fiber, two pole explosion proof rotor. 3. Smooth Bearing: With high smooth Japan original imported flange bearing. Unique stator 0.2mm silicon steel piece, iron loss efficiency up to 94% efficiency conversion. 4. Prime Material: 2 pole ultra soft linear high speed high temperature 200°C rotor new magnetic material, high temperature polyester wire. 5. High Speed Operation: Aluminum front one piece air outlet housing design for smooth and reliable high speed operation. High speed motor operation RPM up to 60000. Specification: Item Type: RC Brushless Motor Weight: 244g / 8.61oz Model: F3650 12T Material: Aluminum Alloy Copper Steel Color: Black and red KV (RPM / volt): 2830KV Output Power: 900W Max. Voltage: <21V Max. Current: 43A Number of Motor Poles: 2 No Load Current: 1.5A Resistance (Ω): 0.0151 Max. Speed: 60000 Motor Feed Angle: 0 degree-15 degree Motor Diameter: 3.6cm / 1.42in Motor Length: 5.38cm / 2.12in (without shaft) Shaft Diameter: 0.3175cm / 0.125in Shaft Length: 1.5cm / 0.59in Suitable For: 1/10 pole speed modified RC car . Package List: 1 x F3650 Brushless Motor1 x Instruction Manual Note: 1. Due to manual measurement, please allow 1‑3mm error, thank you.2. Due to the differences between different monitors, the picture may not reflect the actual color of the item.