Roller Bearing

It suggested to make the changes of roller bearing to be 360 degree inter-changes 

Reason
1) To improve flexibility 
2) Mind and body interaction
3) When you spinning fly over the sky and started to landing down, it need to adjust the pressure from high or low stability optimal controller level, in order to landing down safety
4) prevent high collision pressure intensity
5) Prevent shaking gaze in/within the body and anatomy parts.