This is Elf Hobby 4200Kv Outrunner Brushless Motor 10T

It can be used for the following RC Helicopters: Walkera 22E, 35, 36, 37, 40, 45, 59, 60, 61, 62, 76C, 76E and all other compatiablity rc toys. 

Brushless Motor SPECIFICATION: 

• Type: Outrunner 10T Straight-wheel design Gear
• Working Voltage: 6-18V
• Speed constant (KV): 4200 RPM/V
• Hollow Holding Current (10V): <=1 A
• Dimension: Φ 26x27 mm
• Diameter of axes: Φ 2.3 mm
• Weight: 42g

PACKAGE INCLUDED:

• Elf Hobby 4200Kv Outrunner Brushless Motor with 10T Straight-wheel design Gear
• Screw x 4