3200kv Brushless inrunner motor with 10 tooth pinion, from Walkera.

This motor fits Walkera Dragonfly models 35, 36, 37, 59, 60 and other brands and models of similar size. 

Specs are:

Model No: WK-WS-20-002
Specification:
Dimension:Φ 20 X 40mm Speed constant(KV): 3200RPM/V Working voltage: 6-18V Shaft extension: 11.0mm Shaft diameter: Φ2.3mm Weight: 65g