This is our second generation motor design, we use unibell on this motor at the same time we switch to double step shaft. Without the C-Clips on top of the bell will make the motor balance to the next level.  This motor is design to operate under 2S voltage ( 7.4V) 

These motors come with JST-1.0 plugs installed but also come with a set of Micro JST-1.25's. The BeeBrain Brushless uses Flight controller uses JST-1.0 plugs.