This is the Align 460MX, 3200kV Brushless Motor.

Instructions: 

• Based on 3S voltage, the 460MX (3200KV) motor is made for the T-REX 450L DOMINATOR
• Featuring superior efficiency, high power output, extreme torque, and low current, low temperature 
  
• The 460MX shares the same extraordinary pedigree with the 850MX Dominator motor 
  
• The 460MX motor incorporates a radial fan in its end bell, creating powerful airflow to dissipate heat. Tweaks to motor design and reduction in weight not only contributes to a dramatic power increase, the high efficiency cooling system enables cooler operating temperature during and after flights when compared to motor of previous generation
• The 460MX motor armature has a special balance adjustment to improve the vibration problem that other tiny motors have
• Maintenance free, high torque, high efficiency, low temperature variant, stable and quiet
• Japanese made high-speed ball bearings, powerful magnetic outrunner rotor
• Suitable for T-REX 450E series

Specifications: 
Input voltage: 3S 
Max continuous current: 46A/68A(5sec) 
Max output power: Approx. 500w/730W(5sec) 
KV Value: 3200KV 
Dimensions: spindle 3.5x29.2x38mm 
Weight: Approx. 87g

Includes: 

• (2) Socket button head screw (M2.5X6mm) 
  
• (2) Washer (Φ2.6XΦ5.8X0.6mm) 
  
• (3) ALIGN standard 3mm gilt terminal