This is the E-Flite 5400Kv Park 370 Brushless Motor.  This motor is great if you want to get better and more efficient performance for sport and aerobatic park flyers.

Features:

• Includes a 10T and 12T pinion gear for use with a 6.6:1 or 5.33:1 gearbox
• Slotless 2-pole design
• Prop adapter and gold-plated connectors included
• Adapter plate included for mounting to GWS and E-flite style gearboxes
• Excellent Motor for small airplanes weighing 10-14 oz (280-400 g)
• Great upgrade for Speed 280 and Speed 370 applications

Specifications:
Type: Brushless
Size: Park 370
Bearings or Bushings: Bearings
Recommended Prop Range: 9x4.7 to 12x6
Voltage: 4.8 - 9.6
RPM/Volt (Kv): 5400 Kv
Resistance (Ri): .12 ohms
Idle Current (Io): 1.30A @ 10V
Shaft Diameter: 2mm (.08 in)
Overall Length: 30mm (1.20 in)
Weight: 48g (1.7 oz)
Overall Diameter: 20mm (.80 in)
Diameter: 20 mm (.8 in)
Length: 30 mm (1.2 in)
Continuous Current: 10A
Maximum Burst Current: 15A (15 sec)
Cells: 4-8 NiCd/NiMh or 2 LiPo
Speed Control: 10 - 25 Amp Brushless