This is the E-flite Power 25 1000Kv Brushless Outrunner Helicopter Motor, and is intended for use with the Vibe 500E 3D Pro V5E helicopter.

Features:

Easily accepts the gearing included with the Vibe 500E
Provides outstanding power resulting in aggressive 3D performance
Designed for 4S-6S Li-Po power
External rotor design with built-in cooling fan
High torque, direct drive alternative to inrunner brushless motors
Quiet, lightweight operation
High quality construction with ball bearings and hardened 5mm steel shaft
Specifications:
Type: Brushless Outrunner
Size: 25
Bearings or Bushings: Ball bearings
RPM/Volt (Kv): 1000Kv
Resistance (Ri): .026 ohms
Idle Current (Io): 2.60A @ 20V
Continuous Current: 38A
Maximum Burst Current: 58A (15 sec)
Cells: 4S-6S Li-Po or 12-18 cells Ni-Mh/Ni-Cd
Speed Control: 60A Pro Brushless ESC
Weight: 196 g (6.9 oz)
Overall Diameter: 35mm (1.40 in)
Shaft Diameter: 5mm (.20 in)
Overall Length: 56mm (2.20 in)