Emax 2213-935kV Brushless Motor. Originally found in the EMax Power Pack "B".

Specifications
Input Voltage: 3s-4s LiPo (11.1-14.8V)
Stator Dimensions: 28x25.7mm
Shaft Diameter: 6mm
Mounting Dimensions: 16x19mm w/3mm hole
Recommended Model Weight: 300-1100g (AUW with Battery)
Recommended Prop: 8x4.5 - 10x4.5

Includes:

• (1) EMax 2213-935 Brushless Motor
• (1) Hex Nut
• (3) Female Bullet Connectors
• (2) 10x4.5 Props - 1 "Pusher" 1 "Puller"