The new Advanced PLUS level brushless motor from Solink, see the promotional photos for all the new features.

The external shell is CNC machined from aluminium.  Uses a D Type pinion gear with a hardness rating of HRC35-38.
The motor tower OD is 7.9 and an inner hole diameter of 3.2

Solinks Motor FAQ
https://docs.google.com/document/d/1lkZ2AoD117quTZbo2PIHeNTvgCYvAkw4/

IMPORTANT
1. Do not power the motor with the cables reversed.  Always check this.
2. Solink state that this is the most ETU compatible motor on the market and can be used with AB should you need to, no reported issues currently.  
3. As with all motors if you get a gearbox lock-up, don't keep your finger on the trigger trigger.  Use common sense.
4. If changing the pinion yourself do not force it on, do not whack with a hammer! Too much force will damage the rear bearing or controller.  There's some good guides on YT on how to remove pinion gears on brushless motors.