This is a replacement motor coupler assembly (front and rear parts) which connect the motor on a Kymera Body Board to the drive shaft.
This part includes the front and rear ‘clam shells’ but does not contain the internal rubber damper (as these generally don’t require replacement).  If you need that part, please get in touch.
Replacing a couple requires specialist technical knowledge.  Please contact KymeraDR Support on info@kymeradr.com if you need to replace it.