This is the Xerun V10 G2 25.5 Turn Modified Brushless Motor, recommended for 1/10 on-road, and off-road vehicles. 

Xerun V10 G2 Motors 
Specifically designed for extreme running in top 1/10 and 1/12 scale competition racing, the V10 G2 series motors and are compliant with ROAR, IFMAR, BRCA and JMRCA rules. They featuring the perfect combination of high quality materials, exquisite craftsmanship and cutting edge technology, the V10 G2 series provide the extra advantage all professional racers are looking for with minimal maintenance required. 

Features:

Specifications: 
kV: 1
500 
Current w/o Load: 0.8A 
Current @ Max Output Power: 
85A 
Can Diameter: 36mm 
Can Length: 52.5mm 
Shaft Diameter: 3.175mm 
Shaft Length: 14.6mm 
Weight: 166g 
Rotor: 
Φ5-12.5